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| Southern Terminus: | Jct I-94 & BL I-94 at Exit 92 on the Kalamazoo/Calhoun Co line at the southwestern corner of Battle Creek |
| Northern Terminus: | Old Mission Lighthouse (Peninsula Twp Park) at the tip of the Old Mission Peninsula north of the community of Old Mission |
| Length: |  222.256 miles |
| Maps: |  Route Map of M-37 |
| Notes: | Among several other route changes in Battle Creek and across Calhoun Co as a part of the Rationalization process (1998), the route of M-37 within the City of Battle Creek was altered. On October 31, 1998, the Michigan Department of Transportation took control of dozens of miles of formerly county roads and municipal streets. Among those miles were all of Bedford Rd from the jct of M-37 & M-89 southerly to Helmer Rd, all of Helmer Rd from Bedford Rd southerly to Columbia Ave and all of Columbia Ave from Helmer westerly to BL I-94/Skyline Dr-Martin Luther King Jr Blvd. These roads became part of the realigned M-37 route from M-89 to I-94. M-37 then continued southwesterly via BL I-94 to its new terminus at I-94. Much of the former route of M-37 into downtown Battle Creek became part of an extended M-89. Prior to the change, which resulted in a net gain of approximately 2¾ miles, M-37 was 218.97 miles long. |
| In a reversal of one of the 1998 "Rationalization" transfers, the portion of M-37 along Columbia Ave from Helmer Rd (jct M-96) westerly to BL I-94/Skyline Dr-Martin Luther King Jr Blvd was turned back to the City of Battle Creek on in early May 2005. This created a discontinuity in the route of M-37, but MDOT then chose to relocate M-37 concurrently with BL I-94 via Dickman Rd from Helmer westerly to Skyline Dr-Martin Luther King Jr Blvd and via Skyline-MLKing southwesterly back to its previous route at Columbia Ave, thereby shortening the route of M-37 by 0.29 mile. Route signage in the field was updated to reflect this transfer and rerouting at a later date. | |
| A major rerouting for M-37 (and its concurrent partner designation, BL I-94) on the west side of Battle Creek occurred in 2015 when a segment of BL I-94/M-37 was removed as part of a project to accommodate expanding munitions storage at the adjacent Battle Creek Air National Guard Base. According to the Battle Creek Enquirer,"Battle Creek officials support the closure, saying it will create a joint base for the U.S. Army, Air National Guard and Navy that could boost Fort Custer Training Center's chances of being selected as a ballistic missile defense site." The portion of Skyline Dr/M L King Jr Dr from Columbia Ave northerly to Hill Brady Rd was transferred to the City of Battle Creek, while the portion between Hill Brady Rd and M-96/Dickman Rd was closed and obliterated. MDOT, meanwhile, took jurisdiction of Columbia Ave from Skyline/MLKing easterly to Helmer Rd (for a third time, the second time in 17 years!). The BL I-94/M-37 route now continues northeasterly and easterly from the intersection of Columbia Ave & Skyline/MLKing via Columbia Ave to Helmer Rd, then joins with M-96 along Helmer Rd between Columbia and Dickman Rd where both routes continue on their former paths—BL I-94 easterly via Dickman toward downtown Battle Creek and M-37 northerly toward Urbandale along Helmer Rd. The portion of Dickman Rd from Skyline Dr/MLKing Dr to Helmer Rd which had been designated BL I-94/M-37/M-96 is now just part of M-96. Now measuring 221.935 miles in length, prior to the 2015 rerouting, M-37 was 221.621 miles long—a net gain of 0.314 miles. | |
| A major rerouting for M-37 (and its concurrent partner designation, BL I-94) on the west side of Battle Creek occurred in 2015 when a segment of BL I-94/M-37 was removed as part of a project to accommodate expanding munitions storage at the adjacent Battle Creek Air National Guard Base. According to the Battle Creek Enquirer,"Battle Creek officials support the closure, saying it will create a joint base for the U.S. Army, Air National Guard and Navy that could boost Fort Custer Training Center's chances of being selected as a ballistic missile defense site." The portion of Skyline Dr/M L King Jr Dr from Columbia Ave northerly to Hill Brady Rd was transferred to the City of Battle Creek, while the portion between Hill Brady Rd and M-96/Dickman Rd was closed and obliterated. MDOT, meanwhile, took jurisdiction of Columbia Ave from Skyline/MLKing easterly to Helmer Rd (for a third time, the second time in 17 years!). The BL I-94/M-37 route now continues northeasterly and easterly from the intersection of Columbia Ave & Skyline/MLKing via Columbia Ave to Helmer Rd, then joins with M-96 along Helmer Rd between Columbia and Dickman Rd where both routes continue on their former paths—BL I-94 easterly via Dickman toward downtown Battle Creek and M-37 northerly toward Urbandale along Helmer Rd. The portion of Dickman Rd from Skyline Dr/MLKing Dr to Helmer Rd which had been designated BL I-94/M-37/M-96 is now just part of M-96. Now measuring 221.935 miles in length, prior to the 2015 rerouting, M-37 was 221.621 miles long—a net gain of 0.314 miles. |
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| Site contributor Brian Reynolds sent in a gem of a map and information about a proposed expressway-freeway plan which never came to fruition. Much of the M-37 corridor from Hastings through Grand Rapids to Casnovia was upgraded to modern highway design and geometrics in the 1940s and 50s. South of Hastings, however, M-37 and parallel route M-43 remained on their original alignments from early in the century. In the 1960s, the State Highway Department proposed replacing these two substandard highways with a new expressway-freeway alignment, detailed by Brian on the M-37: Hastings-Battle Creek page. | |
| Plans for a major upgrade to the route of M-37 north of Grand Rapids were never realized, although some of the plans were put into place for a portion of the route. Presently, M-37 heads north from the Grand Rapids area on a five lane highway which becomes a divided highway at 6 Mile Rd and remains so to beyond 10 Mile Rd, where it narrows down to two lanes. North of where M-37 splits off from Alpine Ave, the road becomes a controlled-access "expressway" to its intersection with Apple Ave at the west limits of the Village of Casnovia. The original upgrade plans for M-37 called for a controlled-access freeway or expressway to branch off US-131 in the neighborhood of the Pine Island Dr overpass near Belmont, heading northwesterly to Alpine Ave, then northerly as a western bypass of Sparta, Kent City and Casnovia, continuing as a freeway or divided expressway well into Newaygo Co. The only portion of this plan ultimately completed was the portion from the Alpine Ave split-off (between 9 & 10 Mile Rds) to Apple Ave at Casnovia. Most of this route is a two-lane undivided expressway, with access only at select intersections. Sufficient right-of-way still exists next to the current highway for construction of a second roadway. This will likely never happen. It is unclear how far north the improved M-37 routing was proposed, although the City of Newaygo is a likely candidate. In addition, the proposed freeway or expressway connector between Alpine Ave and US-131 also seems highly unlikely, as numerous new subdivisions have been allowed to pop up in its path. | |
| Before M-37 was completed north of Wolf Lake, M-42 ran along the present-day route of M-37 from Mesick through Traverse City to Old Mission. | |
In "State Trunkline Needs, 1960–1980," a set of maps prepared by the State Highway Dept's Office of Planning, Programming Division in 1960 showing possible additions, upgrades and improvements to the state trunkline system over the ensuing twenty years, MSHD staff recommended several changes to the route of M-37 during that timeframe, including:
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| History: | c.1920 – The original routing of M-37 in the early 1920s runs roughly (and someone convolutedly) along its present-day route from Battle Creek to Grand Rapids via Hastings. |
| 1928 – By 1928, M-37 is extended by more than 85 miles to replace the routing of M-54 in its entirety from Grand Rapids northerly through Newaygo and Baldwin to end at M-63 near Peacock in central Lake Co. | |
| 1930 – M-37 is relocated onto newer, straighter alignment at Kent City and Casnovia. The former route is turned back to local control. | |
| 1934 – Two new short realignments open just north of Dutton in Kent Co and just north of Newaygo in Newaygo Co. The former route segments are both turned back to local control. | |
c.1936–37 – Several route changes come to M-37 in this timeframe:
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| 1938 (Dec 6) – A new 9.285-mile route for M-37 is officially determined between M-43 about 2½ miles west of Hastings then northwesterly to Middleville on the south/west side of the Thornapple River, the opposite side of the existing route of M-37 between the communities. However, the new roadway has not yet been completed and will not be until the next year. The existing route of M-37 from M-43/N Broadway on the north side of Hastings then northwesterly along State Rd into Middleville and then westerly along Main St, across the Thornapple River to the cnr of W Main St & S Broadway St–Arlington St (the northern end of the new M-37 route) is cancelled as a trunkline route and turned back to local control, although it will remain the "marked-and-maintained" highway route until the new highway is completed and opened to traffic. |
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| 1939 (June 10) – The new M-37 route between M-43 west of Hastings and Middleville is completed and opened to traffic, while the M-37 route markers along the former route (State Rd and Main St in Middleville) are removed. With the relocation, three railroad crossings, several curves and grades have been removed from this segment of the route. |
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| 1940 – In anticipation of eventually bridging the gap between north-central Lake Co and Mesick in Wexford Co, all of M-42 north of the M-42/M-115 intersection at Mesick is redesignated as M-37 northerly through Traverse City to the Old Mission area. This creates a two-segment, discontinuous highway between M-63 in Lake Co and M-115 at Mesick. Also, M-37 is scaled back slightly in Battle Creek to end at M-96, ending the M-37/M-96 concurrency. | |
| 1944 (July 19) – State Highway Commissioner Charles Ziegler announces plans for a 15.2-mile long "straightaway of 22-foot concrete pavement" as part of a relocation of M-37 between Middleville and Grand Rapids, to be constructed immediately after the end of World War II. The new roadway, projected to cost $1.25 million and require a labor force of 450 men per year, will shorten the route beween those two cities by four miles. It will also eliminate eight 90º turns and one railroad crossing as compared with the existing aligment. The new alignment's northern end will be at the junction of the Grand Rapids South and East Beltlines southeast of the city. |
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| 1945 – The final few miles of gravel-surfaced M-37 (which are open to traffic as of 1945) are paved, north of Middleville. | |
| 1947 – For ten years, a short 4-mile long segment of graded-earth surface highway has been shown between M-55 and the Wexford/Lake Co line, but this segment is not included on the 1947 Official Michigan Highway map. The "Mileage Log of State Trunkline Routes" published in January 1948 indicates a gap in M-37 from M-63 in Lake Co to M-115 in Mesick. | |
| 1948 – A new, paved segment of M-37 opens from M-63 in north-central Lake Co to M-55 in southwestern Wexford Co. | |
| 1949 (Nov 10) – The southwesterly approach into Traverse City for US-31/M-37 is completely revamped. Starting two miles north of Chums Corners, the highway formerly followed McCrae Hill Rd, a roadway since obliterated from present-day US-31/M-37 northeasterly to the 90-degree curve in South Airport Rd, then South Airport northerly to Veterans Dr (formerly Rennie St), Veterans (Rennie) northerly into Traverse City to 14th St, 14th easterly to Union St and Union northerly to jct M-22/M-72 at Front St downtown. Most of this route is turned back to local control on this date when the newly-completed route following present-day US-31/M-37 is established as a state trunkline from the southern intersection with McCrae Hill Rd northerly to 14th St in Traverse City. Oddly, this leaves a gap in the established route from the cnr of Division St & 14th St and Front St & Union St, although sources indicate the route of US-31/M-37 is likely signed northerly from 14th St along Division St to M-22/M-72/Front St, then easterly along M-22/M-72/Front St back to the former route at Union St. | |
| 1949 (Nov 10) – A new 6.059-mile long segment of state trunkline along new alignment is officially assumed into the state trunkline highway system as part of the relocated route of M-37 between Caledonia and Grand Rapids in southern Kent Co. This segment begins at the jct of BYP US-16, BYP M-21 & BYP US-131 at the cnr of 28th St & East Beltline Ave southeast of Grand Rapids and continues southeasterly along the new alignment Broadmoor Ave to Kraft Ave north of Caledonia. From there, M-37 continues southerly via Kraft Ave along its pre-1922 routing to 92nd St where it picks up its existing routing, continuing on Kraft Ave south to Johnson St, easterly via Johnson to Kinsey St, then southeasterly on Kinsey to Cherry Valley Ave southeast of Caledonia. Interestingly, however, the entire former route of M-37 from Caledonia northwesterly toward Grand Rapids is cancelled at this point, even though there is a gap in the officially determined route of M-37 between Cherry Valley Ave & Kinsey St at Caledonia and Broadmoor Ave & 92nd St northwest of Caledonia. For the time being, the Kinsey–Johnson–Kraft route remains as a "marked & maintained" alignment of M-37. The remainder of the former route along 92nd St between Kraft and Hanna Lake, then northerly via Hanna Lake Ave from 92nd to Wing, northwesterly along Wing Ave from Hanna Lake to 60th, westerly via 60th St from Wing to Kalamazoo, then northerly on Kalamazoo Ave from 60th to BYP US-16/BYP US-131/BYP M-21/28th St (present-day M-11) at Grand Rapids is turned back to county control. |
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| 1951 (Nov 10) – The 4.075-mile remaining gap in the officially-determined route of M-37 from Caledonia northerly is finally assumed into the state trunkline highway system, beginning at Kinsey St southeast of Caledonia and continuing northerly along Cherry Valley Ave to just south of 84th St where it turns northwesterly via the new-alignment segment of Broadmoor Ave, meeting up with the previously completed segment of Broadmoor at Kraft Ave north of Caledonia. This new gravel-surfaced segment of M-37 completes the Caledonia–Grand Rapids relocation of the route and the former route along Kinsey–Johnson–Kraft that was a "marked & maintained" state highway route since late 1949 returns to county maintenance. The new segment, which cost $146,400 to build, will be asphalt surfaced the following spring. |
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| 1952 – M-37 is rerouted in the Grand Rapids area: From the 28th St & East Beltline-Broadmoor Ave intersection, M-37 now heads northerly (concurrently with US-131 and M-21) to Cascade Rd, northwesterly via Cascade (concurrently with BUS M-50) to E Fulton St, then westerly via E Fulton into downtown (concurrently with BUS US-16/BUS M-21/BUS M-50) to the former alignment. Also, the final 15-mile gap in the discontinuous route between M-55 and Mesick is bridged, forming one continuous route between Battle Creek and Old Mission. | |
| 1953 (Nov 6) – In a project designed to remove through traffic and trucks from the heart of Traverse City's downtown core, the entire length of Grandview Parkway running along the shoreline of the West Arm of Grand Traverse Bay is established as a state trunkline on this day and likely opens to traffic at the same time. Simultaneously, Division St from 14th St northerly to the new Grandview Pkwy is also established as a state trunkline, carrying US-31/M-37 northerly from the southwest corner of the city to the parkway where both routes turn easterly along with M-72 to follow Grandview bypassing downtown before merging back into Front St near Railroad Ave. (The rest of Grandview Pkwy from Division St northwesterly to M-72 becomes part of M-22/M-72.) The former route of US-31/M-37/M-72 along Front St from Division St easterly to the new Grandview Pkwy is transferred to local control. | |
| 1957 – A short rerouting onto a new alignment just south of Sparta opens with the former route being turned back to local control. | |
| 1961 – Just over twenty years after removing the concurrent M-37 designation, the
route of M-96 from M-37 northwest of downtown Battle Creek into downtown is once again co-signed
with M-37, much as it was 1927–1940. |
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| 1962 (Jan 9) – As initially implemented in 1957, made permanent in 1958 and officially determined in 1960, eastbound M-96 (and, now, also sbd M-37) traffic entering Battle Creek from the northwest via Michigan Ave has turned southerly via the short, narrow, one-block Thorne St to Jackson St, where it then continues southeasterly into the downtown area. On this date, the 0.148 miles of W Michigan Ave (Angell St to Thorne St) and Thorne St (W Michigan Ave to Jackson St) is transferred to municipal control, while the 0.173 miles of Angell St (W Michigan Ave to Jackson St) and Jackson St (Angell St to Thorne St) are transferred to state control and become the new ebd M-96/sbd M-37 routing. |
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| 1962 – A new M-37 highway alignment opens west of the old route bypassing Sparta, Kent City and Casnovia. This new two-lane, controlled-access highway is constructed along a route scheduled to become an M-37 freeway running northerly from Grand Rapids toward Newaygo, possibly as a northern extension of the US-131 freeway. Also, M-37 is again rerouted thorugh Grand Rapids: From the 28th St & East Beltline-Broadmoor Aves intersection southeast of the city, M-37 now runs westerly via M-11/M-21/28th St to the new US-131 freeway, then northerly via US-131 through downtown to I-96 north of the city and westerly for a short distance on I-96 back to M-37/Alpine Ave. | |
| 1966 (Jan 1) – Existing dual state highway route designations in the Battle Creek area are "simplified" by the State Highway Dept so that several segments of highway formerly bearing two or three routes now only bear one. The result is that the route of M-96 is scaled back to end at a new eastern terminus at M-89 west of Battle Creek just east of the Calhoun/Kalamazoo Co line. What had been formerly designated as M-89/M-96 along W Michigan Ave from M-37/Bedford Rd westerly becomes just M-89, while the concurrent M-37/M-96 along W Michigan Ave east of M-37/Bedford Rd and Angell St–Jackson St (ebd) and Van Buren St (wbd) now becomes just M-37. |
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| 1969 (Oct 29) – Once again, M-37 is rerouted at Grand Rapids: From the intersection of M-11/28th St and M-44/East Beltline Ave in Kentwood, M-37 now runs concurrently with M-44 via East Beltline Ave to I-96 (at Exit 38), then northwest along I-96 to Alpine Ave (at Exit 30). | |
| 1972 (Dec 29) – In conjunction with the proposed M-37 Hastings-Battle Creek Expressway, the route of M-37/M-43 from downtown Hastings westerly to the western jct of M-37 & M-43 is moved to its present-day alignment. The former route of M-37/M-43 via Green St will be turned back to local control the next year. | |
| 1973 (Mar 30, Jun 29) – The former route of M-37/M-43 from downtown Hastings westerly superceeded by the present-day alignment (see above) is turned back to local control. Green St from downtown Hastings (at Broadway St) westerly to the west city limit is turned back to city control on March 30th, while the portion in Rutland Twp from the west limit of Hastings westerly to the new alignment is turned back to the county on June 29th. | |
| 1977 – The concurrent designation of M-37/M-44 is removed when M-44 is scaled back to end at I-96 Exit 38 east of Grand Rapids. | |
| 1984 (June 21) – M-37 is rerouted in Battle Creek to run southerly via Washington Ave to BL I-94/Dickman Rd, then easterly concurrently with BL I-94 along Dickman Rd to end at jct I-194/M-66 at Exit 3. | |
| 1997–98 – With the complete reconstruction of W Michigan Ave in downtown Battle Creek west to Angell St, the parallel alignments of M-37 along Jackson St (sbd) and Van Buren St (nbd) are consolidated onto W Michigan Ave. M-37 still turns southerly at Washington Ave, though, to cross the Kalamazoo River heading toward its meeting with BL I-94/Dickman Rd. Michigan Ave between Washington Ave and M-66/Division St remains a local street. The former one-way routings on Jackson and Van Buren Sts, which were designated in the late 1950s as M-96 (when M-37 ended at M-96/W Michigan Ave in Urbandale), once again become two-way streets. | |
| 1998 (Oct 31) – As a part of the Rationalization process (1998), the route of M-37 within the City of Battle Creek is altered. On this day, MDOT takes control of dozens of miles of formerly county roads and municipal streets. Among those miles is all of Bedford Rd from the jct of M-37 & M-89 southerly to Helmer Rd, all of Helmer Rd from Bedford Rd southerly to Columbia Ave and all of Columbia Ave from Helmer westerly to BL I-94/Skyline Dr-MLKing Jr Mem Hwy. These roads become part of the realigned M-37 route from M-89 to I-94. M-37 then continues southwesterly via BL I-94/Columbia Ave to its new terminus at I-94. Much of the former route of M-37 into downtown Battle Creek becomes part of an extended M-89. | |
| 1999 (Fall) – A project to construct a new overpass spanning the CSX railroad line (originally Pere Marquette Railroad, present-day Marquette Rail line) one mile south of Bailey in eastern Muskegon Co to replace the one built in the mid-1920s (when the route was designated M-54) is completed and opened to traffic. The project not only involves demolishing and constructing a new overpass, but also easing the sharpness of the two curves either side of the overpass, increasing the safety of the highway in the area. The original 1920s overpass spanned the railroad at a 65° angle while the new structure is only skewed at a 43° angle. The former, sharper alignment of M-37 either side of the bridge is obliterated with the new alignment approximately 200 feet (0.039 mile) shorter than the former alignment. |
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| 2000 – The Batle Creek area route changes which officially ocurred in 1998 (see October 31, 1998 above) are finally signed in the field. New route markers denoting the various changes are physically posted along the various routes in the Battle Creek area. | |
| 2003 (Aug) – In late-August, as a part of a complete sign rehabilitation along East Beltline Ave in Grand Rapids, the route of M-44 is "re-extended" south from its terminus at I-96 (Exit 38), concurrently with M-37 to end at M-11/28th St, where M-37 continues southerly toward Hastings and Battle Creek. MDOT had seemingly removed this redundant concurrency in 1977, but inexplicably re-adds it in 2003. | |
| 2005 (May 5) – The 2.3 miles of M-37 along Columbia Ave between Helmer Rd & BL I-94/Skyline Dr-Martin Luther King Jr Blvd in southwestern Battle Creek is transferred back to local control. The route of M-37 is then transferred onto BL I-94 to continue westernly and southwesterly (via Dickman Rd and Skyline Dr-Martin Luther King Jr Blvd) to its terminus at I-94 Exit 92, shortening the entire route of M-37 overall by 0.29 mile. |
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| 2007 (June) – The 17¼ miles of M-37 on Grand Traverse County's Old Mission Peninsula are designated as a Scenic Heritage Route. | |
| 2013 (Apr 15–June 22) – A short realignment along M-37 just north of the Manistee River and the community of Sherman in northwestern Wexford Co eliminates a treacherous 12% grade and a winding S-curve at the location known as "Sherman Hill." The new highway alignment continues due northerly along the section line on a less-steep 7% grade, while the old route, which diverted to the east before curving back to the section line, is obliterated. A total of 275,000 yards of soil and other materials were removed from the site as part of the project. | |
| 2015 (June 24) – As noted in the "Notes" section above, a portion of BL I-94/M-37 along Skyline Dr/Martin Luther King Jr Blvd on the west side of Battle Creek is permanently closed to traffic between Hill Brady Rd and M-96/Dickman Rd to accommodate expanding munitions storage at the adjacent Battle Creek Air National Guard Base. The remainder of Skyline Dr/M L King Jr Blvd is to be transferred to city control. To remedy the discontinuity in the routes of BL I-94 and M-37, the city transfers control of Columbia Ave between Skyline/MLKing and Helmer Rd (this segment having been a state trunkline route from 1932–1959 and from 1998–2005). BL I-94/M-37 now continues easterly from Skyline/MLKing via Columbia Ave to Helmer Rd, then joins M-96 following Helmer Rd back to the former routes of M-37 and BL I-94 at Dickman Rd. The portion of Dickman Rd from Skyline Dr/MLKing Dr to Helmer Rd which had been designated BL I-94/M-37/M-96 is now just part of M-96. Now measuring 221.935 miles in length, prior to the 2015 rerouting, M-37 was 221.621 miles long—a net gain of 0.314 miles. |
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| 2016 (May–June) – In a reversal of the August 2003 "re-extension" of M-44 from I-96 at Exit 38 on the eastern edge of Grand Rapids southerly to M-11/28th St as well as being a "re-truncation" re-implementing MDOT's original removal of the M-44 designation from that portion of East Beltline Ave, the M-44 route markers are again removed from all of M-37/East Beltline Ave south of I-96. M-44's western terminus is, once again, I-96 at Exit 38 and M-37 agains traverses that segment of East Beltline Ave by itself. Much like the 2003 "re-extension" of M-44, this "re-truncation" comes as part of a road sign rehabilitation job along the East Beltline corridor. |
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| Controlled Access: | Freeway: The concurrent segment with I-96 in the Grand Rapids area between Exit 30 and Exit 38. |
Expressway: Two segments of M-37 exist as expressway:
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| Circle Tour: |  Lake Michigan Circle Tour: In Traverse City: From the western jct of US-31/M-37 & M-22/M-72 (cnr of Division St & Grandview Pkwy) to the eastern jct of US-31/M-72 & M-37 (cnr of Front St & Garfield Ave). |
| Pure Michigan Byway: |
 Old Mission Peninsula Scenic Heritage Route: From Traverse City north city limit (just northeast of Peninsula Dr & Center Rd intersection) to the northern terminus of M-37 at the Old Mission Lighthouse. |
| NHS: | Four segments of M-37 are on the National Highway System (NHS):
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| Memorial Highways: | The following Memorial Highway designations have been officially assigned to parts of M-37 by the Michigan Legislature:
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| Photographs: | |
| Weblinks: |
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