US Bridges

Usfs RTE 2231 over Sturgeon River

FairPosted for load

Delta County, Michigan · Sec 17 Nahma Twp · Structure no. 091001000001011

Built
1948
77 years old, rebuilt 1992
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
2 main spans
Daily traffic
10
1998 count
Owner
Federal
U.S. Forest Service

About this bridge

Usfs RTE 2231 over Sturgeon River is a steel stringer/multi-beam or girder carrying Usfs RTE 2231 over Sturgeon River in Delta County, Michigan. It was built in 1948 and reconstructed in 1992, so it is 77 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, projected to reach 50 by 2018. The structure is 66 ft (20.1 m) long and 15 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesUsfs RTE 2231
CrossesSturgeon River
LocationSec 17 Nahma Twp
RouteFederal Lands Road 2231
CountyDelta County
StateMichigan
Coordinates45.94258, -86.70675
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30.3 US tons
Inventory rating23.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length66 ft (20.1 m)
Longest span32 ft (9.8 m)
Deck width15 ft (4.5 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1998)
Projected traffic50 by 2018
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$22,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Usfs RTE 2231 over Sturgeon River built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1992.

What condition is Usfs RTE 2231 over Sturgeon 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 September 2024.

How much traffic does Usfs RTE 2231 over Sturgeon River carry?

About 10 vehicles per day (1998 count).

How long is Usfs RTE 2231 over Sturgeon River?

The structure is 66 ft (20.1 m) long with a longest span of 32 ft (9.8 m) and a deck 15 ft wide.

Who owns Usfs RTE 2231 over Sturgeon River?

It is owned by the U.S. Forest Service.