US Bridges

Rockwell Street over Big Thompson River

Fair

Larimer County, Colorado · 60 Feet West of East Rive · Structure no. EP-RCKWLL-THOM

Built
1971
54 years old, rebuilt 1997
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
4,139
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Rockwell Street over Big Thompson River is a prestressed concrete tee beam carrying Rockwell Street over Big Thompson River in Larimer County, Colorado. It was built in 1971 and reconstructed in 1997, so it is 54 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 4,139 vehicles a day, roughly 13% of them trucks, projected to reach 5,174 by 2043. The structure is 53 ft (16.2 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesRockwell Street
CrossesBig Thompson River
Location60 Feet West of East Rive
RouteCity Street 0
Coordinates40.37522, -105.522
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
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
DeckOther
Main spans1
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span46 ft (14 m)
Deck width37 ft (11.3 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,139 (2023)
Projected traffic5,174 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Rockwell Street over Big Thompson River built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1997.

What condition is Rockwell Street 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 September 2024.

How much traffic does Rockwell Street over Big Thompson River carry?

About 4,139 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Rockwell Street over Big Thompson River?

The structure is 53 ft (16.2 m) long with a longest span of 46 ft (14 m) and a deck 37 ft wide.

Who owns Rockwell Street over Big Thompson River?

It is owned by the City or Municipal Highway Agency.