Total Bridges
5,905
Public highway bridges in South Dakota
State profile · Above national median SD
South Dakota bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in South Dakota — drawn straight from the FHWA National Bridge Inventory.
- 5,905
- Public bridges
- 31.9%
- Good condition
- 16.2%
- Poor condition
- 16.2%
- Structurally deficient
Good Condition
31.9%
1,885 bridges rated 7-9
-18.1pp vs 50% benchmark
Poor Condition
16.2%
959 bridges rated 0-4
Structurally Deficient
16.2%
959 bridges flagged for repair priority
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 — Structurally deficient share 54.1%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — South Dakota (FHWA NBI)
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 on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below South Dakota on the same metric.
66
Guam
15.25% top marginal rate
54
West Virginia
16.02% top marginal rate
46
South Dakota
16.24% top marginal rate
19
Iowa
20.01% top marginal rate
78
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in South Dakota
Six lowest-condition bridges in South Dakota, ranked by composite NBI rating. Each is inspected at least every 24 months.
483 AVENUE
Structurally DeficientOver: WHETSTONE RV
4.8E & 3.2N MILBANK, Grant, SD
Built 1962 Load: 0.9 t ADT: 25
202ND ST.
Structurally DeficientOver: BEAR BUTTE CK
5.3E BEAR BUTTE, Meade, SD
Built 2000 Load: 0.9 t ADT: 50
45980 303 ST.
Structurally DeficientOver: VERMILLION RV
6S & 7.8E IRENE, Clay, SD
Built 1909 Load: 1.8 t ADT: 15
460th Avenue
Structurally DeficientOver: Big Coulee Creek
4S & 2W of Peever, Roberts, SD
Built 1950 Load: 2.2 t ADT: 22
197TH ST
Structurally DeficientOver: TURTLE CK
1N & 1E ST LAWRENCE, Hand, SD
Built 1925 Load: 2.5 t ADT: 25
242 ST
Structurally DeficientOver: CK
1.8E 11.0N PLANKINTON, Aurora, SD
Built 1917 Load: 2.7 t ADT: 101
All Bridges in South Dakota
30410 390 AVE
Structurally DeficientOver: MOSQUITO CK
7.1S,4.8W OF WAGNER, Charles Mix, SD
Built 1941 Load: 2.9 t ADT: 48
468th Avenue
Structurally DeficientOver: N. Fork Whetstone Rv
0.3E & 0.5N of Wilmot, Roberts, SD
Built 1940 Load: 2.9 t ADT: 28
179TH ST
Structurally DeficientOver: TURTLE CREEK
4.0N 4.9W TULARE, Spink, SD
Built 1908 Load: 2.9 t ADT: 55
175TH ST
Structurally DeficientOver: TURTLE CREEK
1S 2.8W REDFIELD, Spink, SD
Built 1909 Load: 2.9 t ADT: 126
166TH ST
Structurally DeficientOver: CREEK
1.6W 0.7S ASHTON, Spink, SD
Built 1930 Load: 2.9 t ADT: 55
10th Avenue SE
Structurally DeficientOver: Moccasin Creek
10th Ave. SE - Aberdeen, Brown, SD
Built 1974 Load: 3.0 t ADT: 2,069
8th Avenue SE
Structurally DeficientOver: Moccasin Creek
8th Ave. SE - Aberdeen, Brown, SD
Built 1976 Load: 3.0 t ADT: 500
254 STREET
Structurally DeficientOver: COTTONWOOD CK
9.9N & 3.3E WANBLEE, Jackson, SD
Built 1950 Load: 3.0 t ADT: 15
451st Avenue
Structurally DeficientOver: Creek
3S & 4W of Claire City, Roberts, SD
Built 1940 Load: 3.0 t ADT: 29
457th Avenue
Structurally DeficientOver: Creek
6N of Sisseton, Roberts, SD
Built 1935 Load: 3.0 t ADT: 35
149TH ST
Structurally DeficientOver: Snake Creek
5N 5.9W of Northville, Spink, SD
Built 1913 Load: 3.0 t ADT: 31
41630 268 ST.
Structurally DeficientOver: TWELVE MILE CK
8.0N,6.3E PARKSTON, Hutchinson, SD
Built 1971 Load: 4.2 t ADT: 69
361ST AVE
Structurally DeficientOver: WOLF CK
7.5N & 1E MILLER, Hand, SD
Built 1913 Load: 4.4 t ADT: 43
125th Street
Structurally DeficientOver: James River
2.5S & 2.4E of Columbia, Brown, SD
Built 1920 Load: 4.5 t ADT: 98
VIKEN ROAD
Structurally DeficientOver: HORSE CK
1 S 3 W OF NEWELL, Butte, SD
Built 1919 Load: 4.5 t ADT: 47
46600 313 ST.
Structurally DeficientOver: CK
7 S & 1.1 E of Hub City, Clay, SD
Built 1925 Load: 4.5 t ADT: 15
2nd Avenue
Structurally DeficientOver: BN Railroad
2nd Ave. Big Stone City, Grant, SD
Built 1914 Load: 4.5 t ADT: 2,560
296th Street
Structurally DeficientOver: East Brule Creek
1N & 8.5E of Beresford, Lincoln, SD
Built 1950 Load: 4.5 t ADT: 20
BREHM RD.
Structurally DeficientOver: CK
29E & 15.5S STURGIS, Meade, SD
Built 1935 Load: 4.5 t ADT: 10
WHITETAIL RD.
Structurally DeficientOver: BEAVER DAM CK
6 E 12 N WHITE OWL, Meade, SD
Built 1955 Load: 4.5 t ADT: 10
COUNTY RD
Structurally DeficientOver: TURKEY RIDGE CK
5W & 6.2N VIBORG, Turner, SD
Built 1913 Load: 4.5 t ADT: 30
41090 296th Street
Structurally DeficientOver: Trib. to Emanuel Creek
6N & 3.7E of Avon, Bon Homme, SD
Built 1935 Load: 4.6 t ADT: 60
133rd Street
Structurally DeficientOver: Creek
4.6E of Groton, Brown, SD
Built 1935 Load: 4.7 t ADT: 98
461 Ave.
Structurally DeficientOver: VERMILLION RV
1W & 1.2S CENTERVILLE, Turner, SD
Built 1910 Load: 4.7 t ADT: 50
391 AVE
Structurally DeficientOver: WEST FIRESTEEL CK
5E 6.8N PLANKINTON, Aurora, SD
Built 1925 Load: 4.8 t ADT: 33
185TH ST
Structurally DeficientOver: TURTLE CK
2S 7.5W TULARE, Spink, SD
Built 1903 Load: 4.8 t ADT: 31
361ST AVE
Structurally DeficientOver: TURTLE CK
1E & 5.8S MILLER, Hand, SD
Built 1930 Load: 4.9 t ADT: 10
207TH ST
Structurally DeficientOver: REDSTONE CK
8.1W DESMET, Kingsbury, SD
Built 1935 Load: 4.9 t ADT: 15
398TH AVENUE
Structurally DeficientOver: ENEMY CK
11W & 3.7 S MITCHELL, Davison, SD
Built 1915 Load: 5.2 t ADT: 64
142 STREET
Structurally DeficientOver: CK
4.2E & 4.5N MARVIN, Grant, SD
Built 1958 Load: 5.4 t ADT: 52
117th Street
Structurally DeficientOver: Creek
2.7W & 2N of Sisseton, Roberts, SD
Built 1965 Load: 5.4 t ADT: 20
107th Street
Structurally DeficientOver: Little Minnesota River
1.5S & 1E of Claire City, Roberts, SD
Built 1950 Load: 5.4 t ADT: 30
141st Street
Structurally DeficientOver: N. Fork Whetstone Rv
3.5E & 0.1N of Corona, Roberts, SD
Built 1935 Load: 5.4 t ADT: 38
279 STREET
Structurally DeficientOver: WEST BR BULL CK
5.5E 6.75N COLOME, Tripp, SD
Built 1955 Load: 5.5 t ADT: 55
378 AVE
Structurally DeficientOver: WEST FIRESTEEL CK
8.5N 4.7E WHITE LAKE, Aurora, SD
Built 1936 Load: 6.1 t ADT: 62
201st Street
Structurally DeficientOver: Cain Creek
4.0N & 1.9W of Wolsey, Beadle, SD
Built 1910 Load: 6.1 t ADT: 56
29160 420th Avenue
Structurally DeficientOver: Dawson Creek
3W & 0.4N of Scotland, Bon Homme, SD
Built 1915 Load: 6.1 t ADT: 60
180th Street
Structurally DeficientOver: Trib. to Big Sioux River
3N & 0.9W of Castlewood, Hamlin, SD
Built 1930 Load: 6.1 t ADT: 25
112th Street
Structurally DeficientOver: Little Minnesota River
3E & 6.5S of Claire City, Roberts, SD
Built 1974 Load: 6.1 t ADT: 35
465th Avenue
Structurally DeficientOver: Creek
1.5S & 2W of Wilmot, Roberts, SD
Built 1945 Load: 6.1 t ADT: 31
403RD AVE
Structurally DeficientOver: TIMBER CREEK
3W & 1.8S TURTON, Spink, SD
Built 1935 Load: 6.1 t ADT: 31
211th Street
Structurally DeficientOver: S. Fork of Pearl Creek
0.6W & 3.0S of Iroquois, Beadle, SD
Built 1930 Load: 6.2 t ADT: 56
425th Avenue
Structurally DeficientOver: Crow Creek
2E & 0.9S of Britton, Marshall, SD
Built 1940 Load: 6.2 t ADT: 51
242nd Street
Structurally DeficientOver: Pipestone Creek
7.5E & 2S of Trent, Moody, SD
Built 1968 Load: 6.2 t ADT: 69
40430 308th Street
Structurally DeficientOver: Choteau Creek
6S & 1.8W of Avon, Bon Homme, SD
Built 1912 Load: 6.4 t ADT: 60
29140 408th Avenue
Structurally DeficientOver: Trib. to Emanuel Creek
11.6N & 8W of Tyndall, Bon Homme, SD
Built 1930 Load: 6.4 t ADT: 50
222 ST
Structurally DeficientOver: REDSTONE CK
W EDGE OF CARTHAGE, Miner, SD
Built 1963 Load: 6.4 t ADT: 320
409th Avenue
Structurally DeficientOver: S. Fork of Pearl Creek
9.4S of Cavour, Beadle, SD
Built 1935 Load: 6.8 t ADT: 120
180th Street
Structurally DeficientOver: Big Sioux River
3N & 1.3W of Castlewood, Hamlin, SD
Built 1930 Load: 6.9 t ADT: 135
I-90 SERVICE ROAD
Structurally DeficientOver: WHITEWOOD CK
1 MI E WHITEWOOD, Lawrence, SD
Built 1938 Load: 7.1 t ADT: 69
Showing 5,701-5,750 of 5,905 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |