I-495 O.L.
I-495 O.L. in 0.18 Mile South Of Md 450, Prince George's County, Maryland received a condition grade of B (61/100). Built in 1964, the bridge carries 226K vehicles daily on I-495 O.L. over Amtrak.
I-495 O.L. carries a B on the BridgeSafety Condition Score with 61/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1964 and is now 62 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-495 O.L. carries an average daily traffic count of 226,100 vehicles, with 5 lane(s) crossing Amtrak. 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-495 O.L. is a 62-year-old bridge located 0.18 Mile South Of Md 450 in Prince George's County, Maryland. The bridge carries I-495 O.L. over Amtrak with 5 traffic lanes, handling approximately 226K vehicles per day. Built in 1964 and reconstructed in 1990, the structure spans 75.6 meters.
The bridge received a Condition Grade of B (61/100) 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-495 O.L. has a Condition Score of 61/100 (Grade B). 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-495 O.L. was built in 1964 and reconstructed in 1990, making it 62 years old. The average bridge age in the United States is 48 years.
I-495 O.L. carries approximately 226K vehicles per day (average daily traffic). The bridge has 5 traffic lanes. It is 75.6 meters long and located on I-495 O.L. in 0.18 Mile South Of Md 450, Prince George's County, Maryland.
No, I-495 O.L. 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-495 O.L. is located 0.18 Mile South Of Md 450 in Prince George's County, Maryland. The bridge carries I-495 O.L. over Amtrak. Its coordinates are 38.957303, -76.864956. It is maintained by State Highway Agency.
I-495 O.L. carries I-495 O.L. over Amtrak. The bridge is 75.6 meters long and was built in 1964, with reconstruction in 1990.
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.