I-20
I-20 in 5 MI N Of Columbia, Richland County, South Carolina received a condition grade of B (61/100). Built in 1965, the bridge carries 124K vehicles daily on I-20 over Broad River.
I-20 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 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 Broad River. 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 5 MI N Of Columbia in Richland County, South Carolina. The bridge carries I-20 over Broad River with 6 traffic lanes, handling approximately 124K vehicles per day. Built in 1965 and reconstructed in 1991, the structure spans 422.8 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-20 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-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 422.8 meters long and located on I-20 in 5 MI 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 5 MI N Of Columbia in Richland County, South Carolina. The bridge carries I-20 over Broad River. Its coordinates are 34.047778, -81.073611. It is maintained by State Highway Agency.
I-20 carries I-20 over Broad River. The bridge is 422.8 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.