US Bridges

120th Avenue over Second Creek

Fair

Adams County, Colorado · .4 MI West of I-76 · Structure no. COMC-15-0.6-01

Built
2001
24 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
14,212
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

120th Avenue over Second Creek is a prestressed concrete stringer/multi-beam or girder carrying 120th Avenue over Second Creek in Adams County, Colorado. It was built in 2001, so it is 24 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 14,212 vehicles a day, roughly 8% of them trucks, projected to reach 18,475 by 2041. The structure is 93 ft (28.4 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries120th Avenue
CrossesSecond Creek
Location.4 MI West of I-76
RouteCity Street 0
CountyAdams County
StateColorado
Coordinates39.91432, -104.82427
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length93 ft (28.4 m)
Longest span88 ft (26.9 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,212 (2021)
Projected traffic18,475 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 120th Avenue over Second Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is 120th Avenue over Second Creek 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 December 2023.

How much traffic does 120th Avenue over Second Creek carry?

About 14,212 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is 120th Avenue over Second Creek?

The structure is 93 ft (28.4 m) long with a longest span of 88 ft (26.9 m) and a deck 43 ft wide.

Who owns 120th Avenue over Second Creek?

It is owned by the City or Municipal Highway Agency.