US Bridges

84th Ave over I 25 Ml

Fair

Adams County, Colorado · Thornton · Structure no. E-17-ACR

Built
2012
13 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
258 ft
2 main spans
Daily traffic
35,245
2024 count
Owner
State
State Highway Agency

About this bridge

84th Ave over I 25 Ml is a prestressed concrete continuous box beam or girders - multiple carrying 84th Ave over I 25 Ml in Adams County, Colorado. It was built in 2012, so it is 13 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 35,245 vehicles a day, roughly 5% of them trucks, projected to reach 45,818 by 2044. The structure is 258 ft (78.5 m) long and 127 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries84th Ave
CrossesI 25 Ml
LocationThornton
RouteCity Street 0
Coordinates39.84889, -104.98605
Functional classUrban Collector

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.2 US tons
Inventory rating38.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length258 ft (78.5 m)
Longest span126 ft (38.5 m)
Deck width127 ft (38.7 m)
Roadway width104 ft (31.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,245 (2024)
Projected traffic45,818 by 2044
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 84th Ave over I 25 Ml built?

It was built in 2012, making it 13 years old in 2025.

What condition is 84th Ave over I 25 Ml 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 July 2024.

How much traffic does 84th Ave over I 25 Ml carry?

About 35,245 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is 84th Ave over I 25 Ml?

The structure is 258 ft (78.5 m) long with a longest span of 126 ft (38.5 m) and a deck 127 ft wide.

Who owns 84th Ave over I 25 Ml?

It is owned by the State Highway Agency.