US Bridges

County Road 4E over Little Thompson River

Fair

Larimer County, Colorado · 0.5 MI E of CO RD 17 · Structure no. LR4E-0.5-17

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
121
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 4E over Little Thompson River is a prestressed concrete tee beam carrying County Road 4E over Little Thompson River in Larimer County, Colorado. It was built in 1975, 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 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 121 vehicles a day, roughly 33% of them trucks, projected to reach 151 by 2043. The structure is 64 ft (19.5 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 4E
CrossesLittle Thompson River
Location0.5 MI E of CO RD 17
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.28344, -105.08397
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.7 US tons
Inventory rating35.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span58 ft (17.7 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic121 (2023)
Projected traffic151 by 2043
Trucks33%
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 4E over Little Thompson River built?

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

What condition is County Road 4E over Little 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 May 2023.

How much traffic does County Road 4E over Little Thompson River carry?

About 121 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is County Road 4E over Little Thompson River?

The structure is 64 ft (19.5 m) long with a longest span of 58 ft (17.7 m) and a deck 26 ft wide.

Who owns County Road 4E over Little Thompson River?

It is owned by the County Highway Agency.