US Bridges

County Road 311 over Colorado River

Fair

Garfield County, Colorado · 0.7 MI S of I-70 Fr. Rd. · Structure no. GAR311-12.54-A

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
2,586
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 311 over Colorado River is a prestressed concrete stringer/multi-beam or girder carrying County Road 311 over Colorado River in Garfield County, Colorado. It was built in 1993, so it is 32 years old, younger 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 2,586 vehicles a day, roughly 44% of them trucks, projected to reach 3,284 by 2042. The structure is 120 ft (36.6 m) long and 35 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty Road 311
CrossesColorado River
Location0.7 MI S of I-70 Fr. Rd.
RouteCounty Highway 0
CountyGarfield County
StateColorado
Coordinates39.53898, -107.64601
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating59.4 US tons
Inventory rating33.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span115 ft (35.1 m)
Deck width35 ft (10.8 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,586 (2023)
Projected traffic3,284 by 2042
Trucks44%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 311 over Colorado River built?

It was built in 1993, making it 32 years old in 2025.

What condition is County Road 311 over Colorado 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 2023.

How much traffic does County Road 311 over Colorado River carry?

About 2,586 vehicles per day (2023 count), of which roughly 44% are trucks.

How long is County Road 311 over Colorado River?

The structure is 120 ft (36.6 m) long with a longest span of 115 ft (35.1 m) and a deck 35 ft wide.

Who owns County Road 311 over Colorado River?

It is owned by the County Highway Agency.