US Bridges

County Road 1 over Blue River

Fair

Grand County, Colorado · 0.75 MI West of ST HWY 9 · Structure no. 049000101.1006A

Built
1990
35 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
1 main span
Daily traffic
1,259
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 1 over Blue River is a prestressed concrete stringer/multi-beam or girder carrying County Road 1 over Blue River in Grand County, Colorado. It was built in 1990, so it is 35 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 1,259 vehicles a day, roughly 27% of them trucks, projected to reach 1,486 by 2042. The structure is 105 ft (32 m) long and 34 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesCounty Road 1
CrossesBlue River
Location0.75 MI West of ST HWY 9
RouteCounty Highway 0
CountyGrand County
StateColorado
Coordinates40.02881, -106.38697
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length105 ft (32 m)
Longest span102 ft (31.1 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,259 (2023)
Projected traffic1,486 by 2042
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 1 over Blue River built?

It was built in 1990, making it 35 years old in 2025.

What condition is County Road 1 over Blue 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 1 over Blue River carry?

About 1,259 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is County Road 1 over Blue River?

The structure is 105 ft (32 m) long with a longest span of 102 ft (31.1 m) and a deck 34 ft wide.

Who owns County Road 1 over Blue River?

It is owned by the County Highway Agency.