US Bridges

Forest Road 6930 over Cisco Br Ontonagon River

FairPosted for load

Ontonagon County, Michigan · 8 MI W of Paulding · Structure no. 090706000001016

Built
1951
74 years old, rebuilt 1993
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
51 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 6930 over Cisco Br Ontonagon River is a concrete tee beam carrying Forest Road 6930 over Cisco Br Ontonagon River in Ontonagon County, Michigan. It was built in 1951 and reconstructed in 1993, so it is 74 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 51 ft (15.5 m) long and 18 ft wide. If it were closed, the detour would be 32.3 mi (52 km).

Location

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CarriesForest Road 6930
CrossesCisco Br Ontonagon River
Location8 MI W of Paulding
RouteFederal Lands Road 6930
CountyOntonagon County
StateMichigan
Coordinates46.41001, -89.34301
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width18 ft (5.5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.3 mi (52 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Road 6930 over Cisco Br Ontonagon River built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1993.

What condition is Forest Road 6930 over Cisco Br Ontonagon 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 August 2024.

How much traffic does Forest Road 6930 over Cisco Br Ontonagon River carry?

About 50 vehicles per day (latest count).

How long is Forest Road 6930 over Cisco Br Ontonagon River?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 18 ft wide.

Who owns Forest Road 6930 over Cisco Br Ontonagon River?

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