I 25 ML
I 25 ML in Thornton, Adams County, Colorado received a condition grade of C (56/100). Built in 1955, the bridge carries 154K vehicles daily on I 25 ML over Pedestrian Underpass.
I 25 ML carries a C on the BridgeSafety Condition Score with 56/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1955 and is now 71 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. I 25 ML carries an average daily traffic count of 154,000 vehicles, with 8 lane(s) crossing Pedestrian Underpass. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I 25 ML is a 71-year-old bridge located Thornton in Adams County, Colorado. The bridge carries I 25 ML over Pedestrian Underpass with 8 traffic lanes, handling approximately 154K vehicles per day. Built in 1955, the structure spans 15.2 meters.
The bridge received a Condition Grade of C (56/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 6/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 25 ML has a Condition Score of 56/100 (Grade C). Its deck is rated 6/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 25 ML was built in 1955, making it 71 years old. The average bridge age in the United States is 48 years.
I 25 ML carries approximately 154K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 15.2 meters long and located on I 25 ML in Thornton, Adams County, Colorado.
No, I 25 ML is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I 25 ML is located Thornton in Adams County, Colorado. The bridge carries I 25 ML over Pedestrian Underpass. Its coordinates are 39.855183, -104.986694. It is maintained by State Highway Agency.
I 25 ML carries I 25 ML over Pedestrian Underpass. The bridge is 15.2 meters long and was built in 1955.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.