US Bridges

M-136 over Black River

Fair

St. Clair County, Michigan · 9.8 MI SE of M-19 · Structure no. 000000000009966

Built
1999
26 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
233 ft
2 main spans
Daily traffic
2,350
2019 count
Owner
State
State Highway Agency

About this bridge

M-136 over Black River is a prestressed concrete box beam or girders - multiple carrying M-136 over Black River in St. Clair County, Michigan. It was built in 1999, so it is 26 years old, younger 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 6 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 2,350 vehicles a day, roughly 2% of them trucks, projected to reach 2,625 by 2040. The structure is 233 ft (71.1 m) long and 47 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesM-136
CrossesBlack River
Location9.8 MI SE of M-19
RouteState Highway 136
CountySt. Clair County
StateMichigan
Coordinates43.05114, -82.59609
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.4 US tons
Inventory rating41.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length233 ft (71.1 m)
Longest span117 ft (35.6 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,350 (2019)
Projected traffic2,625 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-136 over Black River built?

It was built in 1999, making it 26 years old in 2025.

What condition is M-136 over Black River 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 November 2023.

How much traffic does M-136 over Black River carry?

About 2,350 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is M-136 over Black River?

The structure is 233 ft (71.1 m) long with a longest span of 117 ft (35.6 m) and a deck 47 ft wide.

Who owns M-136 over Black River?

It is owned by the State Highway Agency.