Total Bridges
5,905
Public highway bridges in South Dakota
State profile · Above median Poor share
South Dakota bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in South Dakota, based on the FHWA National Bridge Inventory.
- 5,905
- Public bridges
- 31.9%
- Good condition
- 16.2%
- Poor condition
Data updated May 2026
Good Condition
31.9%
1,885 bridges rated 7-9
-18.1pp vs 50% benchmark
Poor Condition
16.2%
959 bridges whose lowest applicable component is rated 0-4
9.2pp vs national avg 7.0%
South Dakota vs national bridge condition
South Dakota - Good condition share 31.9%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
South Dakota - Poor-condition share 54.1%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Counties (66)
Aurora 61 Beadle 153 Bennett 15 Bon Homme 126 Brookings 234 Brown 170 Brule 38 Buffalo 25 Butte 143 Campbell 15 Charles Mix 103 Clark 21 Clay 94 Codington 74 Corson 49 Custer 95 Davison 125 Day 37 Deuel 72 Dewey 28 Douglas 44 Edmunds 20 Fall River 80 Faulk 46 Grant 205 Gregory 51 Haakon 69 Hamlin 62 Hand 126 Hanson 62 Harding 49 Hughes 41 Hutchinson 161 Hyde 23 Jackson 89 Jerauld 35 Jones 37 Kingsbury 35 Lake 79 Lawrence 136 Lincoln 207 Lyman 114 Marshall 39 McCook 98 McPherson 14 Meade 217 Mellette 28 Miner 64 Minnehaha 395 Moody 87 Oglala Lakota 34 Pennington 350 Perkins 60 Potter 24 Roberts 157 Sanborn 53 Spink 176 Stanley 37 Sully 31 Todd 24 Tripp 90 Turner 143 Union 172 Walworth 34 Yankton 99 Ziebach 30
South Dakota vs nearby ranks
Adjacent states by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below South Dakota on the same metric.
GU
Guam
15.25% top marginal rate
WV
West Virginia
16.02% top marginal rate
SD
South Dakota
16.24% top marginal rate
IA
Iowa
20.01% top marginal rate
VI
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in South Dakota
Six lowest-condition bridges in South Dakota, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
483 AVENUE
PoorOver: WHETSTONE RV
4.8E & 3.2N MILBANK, Grant, SD
Built 1962 Load: 0.9 t ADT: 25
202ND ST.
PoorOver: BEAR BUTTE CK
5.3E BEAR BUTTE, Meade, SD
Built 2000 Load: 0.9 t ADT: 50
45980 303 ST.
PoorOver: VERMILLION RV
6S & 7.8E IRENE, Clay, SD
Built 1909 Load: 1.8 t ADT: 15
460th Avenue
PoorOver: Big Coulee Creek
4S & 2W of Peever, Roberts, SD
Built 1950 Load: 2.2 t ADT: 22
197TH ST
PoorOver: TURTLE CK
1N & 1E ST LAWRENCE, Hand, SD
Built 1925 Load: 2.5 t ADT: 25
242 ST
PoorOver: CK
1.8E 11.0N PLANKINTON, Aurora, SD
Built 1917 Load: 2.7 t ADT: 101
All Bridges in South Dakota
473rd Avenue
FairOver: Big Sioux River
8.0W & 8.9N of Flandreau, Moody, SD
Built 1976 Load: 24.5 t ADT: 50
475th Avenue
FairOver: Bachelor Creek
5E & 3.7S of Colman, Moody, SD
Built 1979 Load: 24.5 t ADT: 45
244th Street
FairOver: Trib. to Big Sioux River
4S & 1.2W of Trent, Moody, SD
Built 1939 Load: 24.5 t ADT: 348
478th Avenue
FairOver: Brookfield Creek
0.7S of Trent, Moody, SD
Built 1993 Load: 24.5 t ADT: 45
479th Avenue
FairOver: Big Sioux River
1.4S & 8W of Ward, Moody, SD
Built 1978 Load: 24.5 t ADT: 45
237th Street
FairOver: Brookfield Creek
3N & 2.8E of Trent, Moody, SD
Built 1956 Load: 24.5 t ADT: 50
483rd Avenue
FairOver: Flandreau Creek
2E & 0.4N of Flandreau, Moody, SD
Built 1940 Load: 24.5 t ADT: 350
486th Avenue
FairOver: Flandreau Creek
5E & 0.9N of Flandreau, Moody, SD
Built 1956 Load: 24.5 t ADT: 125
236th Street
FairOver: Pipestone Creek
9.5E & 4.3N of Trent, Moody, SD
Built 1989 Load: 24.5 t ADT: 69
SHERIDAN LAKE ROAD
FairOver: SPRING CK
1.6N3.7W ROCKERVILLE, Pennington, SD
Built 1974 Load: 24.5 t ADT: 933
Copper Hill Drive
FairOver: Red Rock Canyon Drainage
50' E Red Rock Canyon Rd, Pennington, SD
Built 2001 Load: 24.5 t ADT: 200
225TH STREET
FairOver: BOX ELDER CK
2.7N 1.2W ELK VALE EXIT, Pennington, SD
Built 1990 Load: 24.5 t ADT: 78
DYESS AVE
FairOver: BOX ELDER CK
2.3N 1.0W ELK VALE EXIT, Pennington, SD
Built 1990 Load: 24.5 t ADT: 671
RADAR HILL ROAD
FairOver: BOXELDER CK
1.0W 0.3S BOX ELDER, Pennington, SD
Built 1989 Load: 24.5 t ADT: 966
E ASH ST
FairOver: CK
0.06E S A Ave - New Under, Pennington, SD
Built 1955 Load: 24.5 t ADT: 50
E OAK ST
FairOver: CK
0.06E S A Ave - New Under, Pennington, SD
Built 1955 Load: 24.5 t ADT: 50
E PINE ST
FairOver: CK
0.07E S A Ave - New Under, Pennington, SD
Built 1955 Load: 24.5 t ADT: 50
197TH AVE
FairOver: Trib to Cottonwood Creek
0.2E & 0.8S OF QUINN, Pennington, SD
Built 1935 Load: 24.5 t ADT: 19
PRAIRIE CITY ROAD
FairOver: RABBIT CK
17W, 6.9S OF BISON, Perkins, SD
Built 1992 Load: 24.5 t ADT: 91
BIXBY ROAD
FairOver: CABIN CK
4.3 W 23.8 S BISON, Perkins, SD
Built 1954 Load: 24.5 t ADT: 89
HAYNES ROAD
FairOver: GILES CK
4W 7.8S WHITE BUTTE, Perkins, SD
Built 1948 Load: 24.5 t ADT: 26
HAYNES ROAD
FairOver: NORTH FORK GRAND RV
19.7 NORTH OF BISON, Perkins, SD
Built 1996 Load: 24.5 t ADT: 10
FLAT CK ROAD
FairOver: FLAT CK
5.5 SOUTH3.3E WHITE BUTTE, Perkins, SD
Built 2008 Load: 24.5 t ADT: 60
COUNTY RD #4
FairOver: TRIB TO SHADEHILL CK
11E 5N BISON, Perkins, SD
Built 2004 Load: 24.5 t ADT: 45
299 AVENUE
FairOver: CK
11W & 2N GETTYSBURG, Potter, SD
Built 1963 Load: 24.5 t ADT: 15
160 ST
FairOver: CK
1.1W LEBANON, Potter, SD
Built 2007 Load: 24.5 t ADT: 45
155 STREET
FairOver: CK
7S & 0.3W HOVEN, Potter, SD
Built 1940 Load: 24.5 t ADT: 25
455th Avenue
FairOver: Creek
4.8S of Claire City, Roberts, SD
Built 1937 Load: 24.5 t ADT: 412
455th Avenue
FairOver: Creek
5.1S of Claire City, Roberts, SD
Built 1937 Load: 24.5 t ADT: 412
455th Avenue
FairOver: Creek
6.1S of Claire City, Roberts, SD
Built 1937 Load: 24.5 t ADT: 408
458th Avenue
FairOver: Creek
0.1S of Jct with SD 10, Roberts, SD
Built 1941 Load: 24.5 t ADT: 5,850
458th Avenue
FairOver: Creek
0.6S of Jct with SD 10, Roberts, SD
Built 1941 Load: 24.5 t ADT: 5,850
459th Avenue
FairOver: Creek
9.2S of Jct with SD 10, Roberts, SD
Built 1941 Load: 24.5 t ADT: 1,650
459th Avenue
FairOver: Creek
10.2S of Jct with SD 10, Roberts, SD
Built 1941 Load: 24.5 t ADT: 1,600
118th Street
FairOver: Creek
1.5E & 1N of Sisseton, Roberts, SD
Built 1983 Load: 24.5 t ADT: 75
460th Avenue
FairOver: Creek
7W & 2N of Wilmot, Roberts, SD
Built 1930 Load: 24.5 t ADT: 22
462nd Avenue
FairOver: Creek
3.9S of Peever, Roberts, SD
Built 1931 Load: 24.5 t ADT: 271
125th Street
FairOver: Jorgenson River
2N & 2E of Peever, Roberts, SD
Built 1981 Load: 24.5 t ADT: 68
127th Street
FairOver: Jorgenson River
2.2E of Peever, Roberts, SD
Built 1939 Load: 24.5 t ADT: 198
466th Avenue
FairOver: Jim Creek
8E & 2.5N of Sisseton, Roberts, SD
Built 1964 Load: 24.5 t ADT: 15
119th Street
FairOver: Jim Creek
9.9E SISSETON, Roberts, SD
Built 1935 Load: 24.5 t ADT: 294
141st Street
FairOver: Creek
1.9W & 0.2N of Corona, Roberts, SD
Built 1969 Load: 24.5 t ADT: 68
471st Avenue
FairOver: Creek
1W & 0.7N of Corona, Roberts, SD
Built 1984 Load: 24.5 t ADT: 68
140th Street
FairOver: N. Fork Whetstone Rv
2.5E & 2N of Corona, Roberts, SD
Built 1973 Load: 24.5 t ADT: 88
101st Street
FairOver: Creek
0.7W of White Rock, Roberts, SD
Built 1929 Load: 24.5 t ADT: 144
394th Ave.
FairOver: SAND CK
3W & 6.9N WOONSOCKET, Sanborn, SD
Built 1970 Load: 24.5 t ADT: 56
236TH STREET
FairOver: MORRIS CK
6S & 0.7W WOONSOCKET, Sanborn, SD
Built 1963 Load: 24.5 t ADT: 183
399TH AVE.
FairOver: SAND CK
2E & 7.2N WOONSOCKET, Sanborn, SD
Built 1982 Load: 24.5 t ADT: 56
228TH STREET
FairOver: SAND CK
5.1E & 2N WOONSOCKET, Sanborn, SD
Built 1969 Load: 24.5 t ADT: 56
RIVER RD.
FairOver: SAND CK
0.2 NE FORESTBURG, Sanborn, SD
Built 1963 Load: 24.5 t ADT: 56
Showing 1,601-1,650 of 5,905 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.