US Bridges

M-28|M-64 over Merryweather Creek

Fair

Ontonagon County, Michigan · 0.1 MI E of W Jet M-64 · Structure no. 000000000008485

Built
1932
93 years old, rebuilt 1987
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
2,120
2007 count
Owner
State
State Highway Agency

About this bridge

M-28|M-64 over Merryweather Creek is a concrete tee beam carrying M-28|M-64 over Merryweather Creek in Ontonagon County, Michigan. It was built in 1932 and reconstructed in 1987, so it is 93 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,120 vehicles a day, roughly 14% of them trucks, projected to reach 2,814 by 2018. The structure is 31 ft (9.4 m) long and 38 ft wide. If it were closed, the detour would be 41 mi (66 km).

Location

Open in Google Maps
CarriesM-28|M-64
CrossesMerryweather Creek
Location0.1 MI E of W Jet M-64
RouteState Highway 28
CountyOntonagon County
StateMichigan
Coordinates46.5683, -89.65039
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span27 ft (8.3 m)
Deck width38 ft (11.7 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,120 (2007)
Projected traffic2,814 by 2018
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$4,000
NavigationNo navigation control on waterway

Frequently asked questions

When was M-28|M-64 over Merryweather Creek built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1987.

What condition is M-28|M-64 over Merryweather Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does M-28|M-64 over Merryweather Creek carry?

About 2,120 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is M-28|M-64 over Merryweather Creek?

The structure is 31 ft (9.4 m) long with a longest span of 27 ft (8.3 m) and a deck 38 ft wide.

Who owns M-28|M-64 over Merryweather Creek?

It is owned by the State Highway Agency.