US Bridges

Keno Road (cr 602) over S Br Au Sable River

Fair

Roscommon County, Michigan · Section 8&9 T24N R1W · Structure no. 000000000009030

Built
1976
49 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
46 ft
1 main span
Daily traffic
161
2019 count
Owner
County
County Highway Agency

About this bridge

Keno Road (cr 602) over S Br Au Sable River is a concrete box beam or girders - multiple carrying Keno Road (cr 602) over S Br Au Sable River in Roscommon County, Michigan. It was built in 1976, so it is 49 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.

It carries about 161 vehicles a day, projected to reach 239 by 2039. The structure is 46 ft (14 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesKeno Road (cr 602)
CrossesS Br Au Sable River
LocationSection 8&9 T24N R1W
RouteCounty Highway 0
CountyRoscommon County
StateMichigan
Coordinates44.48126, -84.45099
Functional classRural Minor Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating67.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic161 (2019)
Projected traffic239 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Keno Road (cr 602) over S Br Au Sable River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Keno Road (cr 602) over S Br Au Sable 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 June 2024.

How much traffic does Keno Road (cr 602) over S Br Au Sable River carry?

About 161 vehicles per day (2019 count).

How long is Keno Road (cr 602) over S Br Au Sable River?

The structure is 46 ft (14 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns Keno Road (cr 602) over S Br Au Sable River?

It is owned by the County Highway Agency.