US Bridges

County Road 9 over Alamosa River

Fair

Conejos County, Colorado · 0.2 MI N of SH 15 · Structure no. CON04.0W-14.2NA

Built
1998
27 years old
Condition
Fair
inspected March 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
75
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 9 over Alamosa River is a prestressed concrete box beam or girders - multiple carrying County Road 9 over Alamosa River in Conejos County, Colorado. It was built in 1998, so it is 27 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 75 vehicles a day, projected to reach 86 by 2042. The structure is 41 ft (12.6 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 9
CrossesAlamosa River
Location0.2 MI N of SH 15
RouteCounty Highway 0
CountyConejos County
StateColorado
Coordinates37.28747, -106.09289
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66.2 US tons
Inventory rating41.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadUnknown
Structure length41 ft (12.6 m)
Longest span39 ft (11.8 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic86 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 9 over Alamosa River built?

It was built in 1998, making it 27 years old in 2025.

What condition is County Road 9 over Alamosa 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 March 2025.

How much traffic does County Road 9 over Alamosa River carry?

About 75 vehicles per day (2022 count).

How long is County Road 9 over Alamosa River?

The structure is 41 ft (12.6 m) long with a longest span of 39 ft (11.8 m) and a deck 31 ft wide.

Who owns County Road 9 over Alamosa River?

It is owned by the County Highway Agency.