US Bridges

County Road 300 over Colorado River

Fair

Garfield County, Colorado · 8.5 M SW Stone Quarry RD · Structure no. GAR300-00.80

Built
1985
40 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
304 ft
2 main spans
Daily traffic
585
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 300 over Colorado River is a steel continuous stringer/multi-beam or girder carrying County Road 300 over Colorado River in Garfield County, Colorado. It was built in 1985, so it is 40 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 5 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 585 vehicles a day, roughly 38% of them trucks, projected to reach 743 by 2042. The structure is 304 ft (92.8 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesCounty Road 300
CrossesColorado River
Location8.5 M SW Stone Quarry RD
RouteCounty Highway 0
CountyGarfield County
StateColorado
Coordinates39.39319, -108.10255
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating40.3 US tons
Inventory rating24.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length304 ft (92.8 m)
Longest span146 ft (44.5 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic585 (2023)
Projected traffic743 by 2042
Trucks38%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 300 over Colorado River built?

It was built in 1985, making it 40 years old in 2025.

What condition is County Road 300 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 300 over Colorado River carry?

About 585 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is County Road 300 over Colorado River?

The structure is 304 ft (92.8 m) long with a longest span of 146 ft (44.5 m) and a deck 28 ft wide.

Who owns County Road 300 over Colorado River?

It is owned by the County Highway Agency.