US Bridges

3rd Ave. EB over Gw RR

Fair

Boulder County, Colorado · 0.15 MI W of JCT 119 · Structure no. LONG-3RDEB-GWRR

Built
1969
56 years old, rebuilt 2012
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
124 ft
3 main spans
Daily traffic
7,667
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

3rd Ave. EB over Gw RR is a steel continuous stringer/multi-beam or girder carrying 3rd Ave. EB over Gw RR in Boulder County, Colorado. It was built in 1969 and reconstructed in 2012, so it is 56 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 7,667 vehicles a day, roughly 14% of them trucks, projected to reach 9,200 by 2043. The structure is 124 ft (37.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries3rd Ave. EB
CrossesGw RR
Location0.15 MI W of JCT 119
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.16089, -105.06944
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.6 US tons
Inventory rating21.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length124 ft (37.7 m)
Longest span50 ft (15.2 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,667 (2023)
Projected traffic9,200 by 2043
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 3rd Ave. EB over Gw RR built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2012.

What condition is 3rd Ave. EB over Gw RR 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 January 2025.

How much traffic does 3rd Ave. EB over Gw RR carry?

About 7,667 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is 3rd Ave. EB over Gw RR?

The structure is 124 ft (37.7 m) long with a longest span of 50 ft (15.2 m) and a deck 44 ft wide.

Who owns 3rd Ave. EB over Gw RR?

It is owned by the City or Municipal Highway Agency.