I-20
I-20 in 4mi N Of Columbia, Richland County, South Carolina received a condition grade of B (69/100). Built in 1965, the bridge carries 124K vehicles daily on I-20 over Sou. RR & Priv. RD. ..
I-20 carries a B on the BridgeSafety Condition Score with 69/100. 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 1965 and is now 61 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-20 carries an average daily traffic count of 123,700 vehicles, with 6 lane(s) crossing Sou. RR & Priv. RD. .. 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-20 is a 61-year-old bridge located 4mi N Of Columbia in Richland County, South Carolina. The bridge carries I-20 over Sou. RR & Priv. RD. . with 6 traffic lanes, handling approximately 124K vehicles per day. Built in 1965 and reconstructed in 1991, the structure spans 66.4 meters.
The bridge received a Condition Grade of B (69/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-20 has a Condition Score of 69/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-20 was built in 1965 and reconstructed in 1991, making it 61 years old. The average bridge age in the United States is 48 years.
I-20 carries approximately 124K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 66.4 meters long and located on I-20 in 4mi N Of Columbia, Richland County, South Carolina.
No, I-20 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-20 is located 4mi N Of Columbia in Richland County, South Carolina. The bridge carries I-20 over Sou. RR & Priv. RD. .. Its coordinates are 34.050000, -81.068333. It is maintained by State Highway Agency.
I-20 carries I-20 over Sou. RR & Priv. RD. .. The bridge is 66.4 meters long and was built in 1965, with reconstruction in 1991.
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.