US Bridges

81st Avenue over Trib to Second Creek

Good

Adams County, Colorado · 0.1 MI W of Tower RD · Structure no. COMC-27-0.1-01

Built
1995
30 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete
Length
56 ft
3 main spans
Daily traffic
3,842
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

81st Avenue over Trib to Second Creek is a concrete culvert carrying 81st Avenue over Trib to Second Creek in Adams County, Colorado. It was built in 1995, so it is 30 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,842 vehicles a day, roughly 2% of them trucks, projected to reach 4,994 by 2041. The structure is 56 ft (17.2 m) long and 80 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Carries81st Avenue
CrossesTrib to Second Creek
Location0.1 MI W of Tower RD
RouteCity Street 0
Coordinates39.84378, -104.77397
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length56 ft (17.2 m)
Longest span18 ft (5.5 m)
Deck width80 ft (24.4 m)
Roadway width59 ft (18.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,842 (2021)
Projected traffic4,994 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 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 81st Avenue over Trib to Second Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is 81st Avenue over Trib to Second Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does 81st Avenue over Trib to Second Creek carry?

About 3,842 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is 81st Avenue over Trib to Second Creek?

The structure is 56 ft (17.2 m) long with a longest span of 18 ft (5.5 m) and a deck 80 ft wide.

Who owns 81st Avenue over Trib to Second Creek?

It is owned by the City or Municipal Highway Agency.