US Bridges

EB 6th Avenue over Seminole ST | Mariposa S

Fair

Denver County, Colorado · 0.35 MI E of I-25 · Structure no. D-03-V-161

Built
1965
60 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,430 ft
18 main spans
Daily traffic
31,795
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

EB 6th Avenue over Seminole ST | Mariposa S is a steel continuous stringer/multi-beam or girder carrying EB 6th Avenue over Seminole ST | Mariposa S in Denver County, Colorado. It was built in 1965, so it is 60 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 31,795 vehicles a day, roughly 5% of them trucks, projected to reach 35,292 by 2041. The structure is 1,430 ft (435.9 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesEB 6th Avenue
CrossesSeminole ST | Mariposa S
Location0.35 MI E of I-25
RouteCity Street 0
CountyDenver County
StateColorado
Coordinates39.72556, -105.00588
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.3 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans18
Design loadHS 20
Structure length1,430 ft (435.9 m)
Longest span90 ft (27.4 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,795 (2021)
Projected traffic35,292 by 2041
Trucks5%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$9.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was EB 6th Avenue over Seminole ST | Mariposa S built?

It was built in 1965, making it 60 years old in 2025.

What condition is EB 6th Avenue over Seminole ST | Mariposa S 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 EB 6th Avenue over Seminole ST | Mariposa S carry?

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

How long is EB 6th Avenue over Seminole ST | Mariposa S?

The structure is 1,430 ft (435.9 m) long with a longest span of 90 ft (27.4 m) and a deck 53 ft wide.

Who owns EB 6th Avenue over Seminole ST | Mariposa S?

It is owned by the City or Municipal Highway Agency.