US Bridges

WB 6th Ave over Seminole Road

Fair

Denver County, Colorado · 0.3 MI E of I-25 · Structure no. D-03-V-170

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
31,795
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

WB 6th Ave over Seminole Road is a steel stringer/multi-beam or girder carrying WB 6th Ave over Seminole Road in Denver County, Colorado. It was built in 1958, so it is 67 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 5 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 31,795 vehicles a day, roughly 5% of them trucks, projected to reach 35,292 by 2041. The structure is 81 ft (24.8 m) long and 39 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesWB 6th Ave
CrossesSeminole Road
Location0.3 MI E of I-25
RouteCity Street 0
CountyDenver County
StateColorado
Coordinates39.72572, -105.00607
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.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.8 US tons
Inventory rating41.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length81 ft (24.8 m)
Longest span77 ft (23.4 m)
Deck width39 ft (12 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,795 (2021)
Projected traffic35,292 by 2041
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$395,000
NavigationNo navigation control on waterway

Frequently asked questions

When was WB 6th Ave over Seminole Road built?

It was built in 1958, making it 67 years old in 2025.

What condition is WB 6th Ave over Seminole Road 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 November 2024.

How much traffic does WB 6th Ave over Seminole Road carry?

About 31,795 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is WB 6th Ave over Seminole Road?

The structure is 81 ft (24.8 m) long with a longest span of 77 ft (23.4 m) and a deck 39 ft wide.

Who owns WB 6th Ave over Seminole Road?

It is owned by the City or Municipal Highway Agency.