I-77 SB over US 21

Poor Condition50 years old36,350 vehicles/day

Location

StateSouth Carolina
CountyRichland
Location10 Mi N. Columbia
CarriesI-77 SB
CrossesUS 21
Coordinates34.17115, -80.97161

Condition Ratings

Overall ConditionPoor
Deck6 (Satisfactory)
Superstructure4 (Poor)
Substructure6 (Satisfactory)
Scour CriticalNot applicable

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length270.0 ft (82.3 m)
Max Span92.8 ft (28.3 m)
Deck Width49.2 ft (15 m)
Deck Area1234.5 sq m
Main Spans4
Year Built1976

Traffic

Avg Daily Traffic36,350 (2023)
Truck Traffic14%
Lanes On Bridge3
Lanes Under Bridge6

Inspection & Ownership

Last Inspection124
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number000000000006918

Nearby Bridges

I-77 NB over US 21 0.0 mi Fair S-40-1695 over I-77 1.1 mi Fair S-40-1694 over Beasley Creek 1.5 mi Poor S-40-1437 over I-77 1.7 mi Fair Sc 555 over Roberts Branch 2.0 mi Good S-40-1352 over Beasleys Creek 2.1 mi Good I-77 over Roberts Branch 2.1 mi Fair S-40-52 over Rr Ns 2.5 mi Good S-40-52 EB over I-77 2.5 mi Good S-40-52 WB over I-77 2.5 mi Good