US Bridges

County Road 27 over S.P. RR

Fair

Routt County, Colorado · 11.3 MI N of ST HWY 131 · Structure no. 107002711.30727

Built
1975
50 years old, rebuilt 1990
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
110 ft
3 main spans
Daily traffic
802
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 27 over S.P. RR is a prestressed concrete tee beam carrying County Road 27 over S.P. RR in Routt County, Colorado. It was built in 1975 and reconstructed in 1990, so it is 50 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 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 802 vehicles a day, roughly 44% of them trucks, projected to reach 954 by 2042. The structure is 110 ft (33.5 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCounty Road 27
CrossesS.P. RR
Location11.3 MI N of ST HWY 131
RouteCounty Highway 0
CountyRoutt County
StateColorado
Coordinates40.36128, -107.04968
Functional classRural Major 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating27.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span37 ft (11.4 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic802 (2023)
Projected traffic954 by 2042
Trucks44%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 27 over S.P. RR built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1990.

What condition is County Road 27 over S.P. RR 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 October 2024.

How much traffic does County Road 27 over S.P. RR carry?

About 802 vehicles per day (2023 count), of which roughly 44% are trucks.

How long is County Road 27 over S.P. RR?

The structure is 110 ft (33.5 m) long with a longest span of 37 ft (11.4 m) and a deck 32 ft wide.

Who owns County Road 27 over S.P. RR?

It is owned by the County Highway Agency.