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Bridge Safety in South Dakota

5,883 bridges — 945 Poor condition — avg age 49 years.

Bridge Inventory

Total Bridges5,883
Good Condition2,038
Fair Condition2,900
Poor Condition945
Oldest BridgeBuilt 1900
Average Age49 years

Condition Summary

% Good34.6%
% Fair49.3%
% Poor16.1%

Highest-Traffic Poor Condition Bridges in South Dakota

Poor condition bridges sorted by daily traffic — the most urgent safety concerns.

Bridge Condition Year Built ADT Length
MOCCASIN CK Poor 1954 21,635 —
BIG SIOUX RIVER Poor 1979 13,800 —
BIG SIOUX RIVER Poor 1986 9,363 —
SD038 Poor 1989 8,815 —
302 ST (FAS 6372) Poor 1960 8,020 —
BIG SIOUX RV Poor 1966 7,985 —
BIG SIOUX RV Poor 1966 7,985 —
CAPITOL LAKE OUTLET Poor 1950 7,155 —
BIG SIOUX RIVER Poor 1975 5,300 —
BIG SIOUX RV Poor 1974 4,970 —
RAPID CK Poor 1974 4,700 —
R&W RR Poor 1952 4,431 —
SPEARFISH CK Poor 1988 3,981 —
MARNE CREEK Poor 1976 3,980 —
CK Poor 1946 3,776 —
JAMES RV Poor 1960 3,601 —
WEST PIPESTONE CK Poor 1953 3,442 —
ELM RV Poor 1959 3,041 —
CK Poor 1974 2,666 —
R&W RR Poor 1953 2,622 —

Oldest Bridges in South Dakota

Bridge Condition Year Built Age ADT
SAND CREEK Fair 1900 126 yrs 156
PEARL CREEK Fair 1900 126 yrs 103
BIG SIOUX RV Poor 1900 126 yrs 63
JAMES RIVER Poor 1900 126 yrs 98
CLAY CK DITCH Poor 1900 126 yrs 97
DRY CHOTEAU CREEK Fair 1901 125 yrs 60
CK Fair 1901 125 yrs 35
CK Poor 1901 125 yrs 25
SPEARFISH CK Poor 1901 125 yrs 50
ROCK CK Poor 1901 125 yrs 75

Bridge Safety in South Dakota

Bridge condition data for South Dakota comes from the FHWA National Bridge Inventory. All publicly accessible bridges with a span over 20 feet are inspected at least every 24 months by certified bridge inspectors.

All South Dakota Bridges Poor Condition Historic Bridges Scour Critical
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