US Bridges

County Road 77 over White River

Fair

Rio Blanco County, Colorado · 0.5 MI E of ST HWY 64 · Structure no. RIOB-077-00.49

Built
1955
70 years old, rebuilt 1992
Condition
Fair
inspected September 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
132 ft
2 main spans
Daily traffic
93
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 77 over White River is a steel continuous girder and floorbeam system carrying County Road 77 over White River in Rio Blanco County, Colorado. It was built in 1955 and reconstructed in 1992, so it is 70 years old, older than the Colorado average of 42.2 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 93 vehicles a day, roughly 24% of them trucks, projected to reach 112 by 2043. The structure is 132 ft (40.2 m) long and 12 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesCounty Road 77
CrossesWhite River
Location0.5 MI E of ST HWY 64
RouteCounty Highway 0
CountyRio Blanco County
StateColorado
Coordinates40.1625, -108.34517
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating25.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span69 ft (20.9 m)
Deck width12 ft (3.7 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic93 (2023)
Projected traffic112 by 2043
Trucks24%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road 77 over White River built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1992.

What condition is County Road 77 over White 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 County Road 77 over White River carry?

About 93 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is County Road 77 over White River?

The structure is 132 ft (40.2 m) long with a longest span of 69 ft (20.9 m) and a deck 12 ft wide.

Who owns County Road 77 over White River?

It is owned by the County Highway Agency.