US Bridges

County Road 11H over Big Thompson River

Fair

Larimer County, Colorado · 0.3 MI N of ST HWY 402 · Structure no. LR11H-0.3-S402

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
8,892
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 11H over Big Thompson River is a prestressed concrete tee beam carrying County Road 11H over Big Thompson River in Larimer County, Colorado. It was built in 1966, so it is 59 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 8,892 vehicles a day, roughly 7% of them trucks, projected to reach 11,115 by 2042. The structure is 73 ft (22.2 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 11H
CrossesBig Thompson River
Location0.3 MI N of ST HWY 402
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.38306, -105.05436
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length73 ft (22.2 m)
Longest span69 ft (21.1 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,892 (2023)
Projected traffic11,115 by 2042
Trucks7%
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$441,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 11H over Big Thompson River built?

It was built in 1966, making it 59 years old in 2025.

What condition is County Road 11H over Big Thompson 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 June 2023.

How much traffic does County Road 11H over Big Thompson River carry?

About 8,892 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is County Road 11H over Big Thompson River?

The structure is 73 ft (22.2 m) long with a longest span of 69 ft (21.1 m) and a deck 24 ft wide.

Who owns County Road 11H over Big Thompson River?

It is owned by the County Highway Agency.