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
IRR SD047
FairOver: SOLDIER CK
0.3 NE BIG BEND DAM, Buffalo, SD
Built 1963 Load: 24.2 t ADT: 865
SD010
FairOver: BR SPRING CK
1.8 W JCT US 83, Campbell, SD
Built 1961 Load: 24.2 t ADT: 404
241st Street
FairOver: Medicine Creek
0.6W of Kennebec, Lyman, SD
Built 1932 Load: 24.2 t ADT: 60
SD047
FairOver: CK
4.7 N JCT SD 10, McPherson, SD
Built 1954 Load: 24.3 t ADT: 143
ERSKINE
FairOver: BOXELDER CREEK
T 2 N R 5 E SEC 1, Pennington, SD
Built 1971 Load: 24.3 t ADT: 25
SD034
FairOver: DRAINAGE DITCH
0.9 E OF WOONSOCKET, Sanborn, SD
Built 1936 Load: 24.3 t ADT: 1,468
407TH AVE
FairOver: CREEK
1E & 0.4N TURTON, Spink, SD
Built 1955 Load: 24.3 t ADT: 50
409th Avenue
FairOver: Shue Creek
2W & 2N of Yale, Beadle, SD
Built 1990 Load: 24.4 t ADT: 66
SD027
FairOver: MARBLE GULCH
2.9 S NORTH DAKOTA LINE, Marshall, SD
Built 1960 Load: 24.4 t ADT: 667
I090 WB ON RAMP
FairOver: CHANNEL CK
2.9 W OF BOX ELDER, Pennington, SD
Built 1962 Load: 24.4 t ADT: 6,028
IRR BIA RTE 9
FairOver: ABEAR CREEK
10 KM EAST OF JCT SD 63, Ziebach, SD
Built 1962 Load: 24.4 t ADT: 93
252 ST, OLD HWY 16
FairOver: PLATTE CK
1.2 E OF BRULE CO. LINE, Aurora, SD
Built 1950 Load: 24.5 t ADT: 170
247 ST
FairOver: CK
4.8N 4.3E WHITE LAKE, Aurora, SD
Built 1936 Load: 24.5 t ADT: 60
385 AVE
FairOver: CK
3W 0.2S STICKNEY, Aurora, SD
Built 1934 Load: 24.5 t ADT: 117
386 AVE
FairOver: CK
14.2N PLANKINTON, Aurora, SD
Built 1945 Load: 24.5 t ADT: 50
386 AVE
FairOver: CK
11.8N PLANKINTON, Aurora, SD
Built 1940 Load: 24.5 t ADT: 55
249 ST
FairOver: CK
5.3E 4N PLANKINTON, Aurora, SD
Built 1972 Load: 24.5 t ADT: 33
244 ST
FairOver: CK
1S 0.9W STORLA, Aurora, SD
Built 1935 Load: 24.5 t ADT: 65
OLD HWY 16
FairOver: CK
DAVISON CO. LINE, Aurora, SD
Built 1951 Load: 24.5 t ADT: 495
374th Avenue
FairOver: Silver Creek
4.9S of Wessington, Beadle, SD
Built 1940 Load: 24.5 t ADT: 260
374th Avenue
FairOver: Creek
5.8S of Wessington, Beadle, SD
Built 1925 Load: 24.5 t ADT: 200
374th Avenue
FairOver: Sand Creek
13W & 2.4N of Virgil, Beadle, SD
Built 1900 Load: 24.5 t ADT: 156
209th Street
FairOver: Sand Creek
7S & 0.9E of Wessington, Beadle, SD
Built 1930 Load: 24.5 t ADT: 70
375th Avenue
FairOver: Creek
10W & 8.9S of Wolsey, Beadle, SD
Built 1958 Load: 24.5 t ADT: 120
191st Street
FairOver: Creek
11N & 1.9E of Wessington, Beadle, SD
Built 1926 Load: 24.5 t ADT: 56
209th Street
FairOver: Silver Creek
7S & 4.1E of Wessington, Beadle, SD
Built 1939 Load: 24.5 t ADT: 85
214th Street
FairOver: Sand Creek
8.5W of Virgil, Beadle, SD
Built 1925 Load: 24.5 t ADT: 162
217th Street
FairOver: Sand Creek
12S & 5.2W of Wolsey, Beadle, SD
Built 1928 Load: 24.5 t ADT: 56
382nd Avenue
FairOver: Sand Creek
7W & 1.3S of Virgil, Beadle, SD
Built 1935 Load: 24.5 t ADT: 56
383rd Avenue
FairOver: Cain Creek
7E & 0.9N of Wessington, Beadle, SD
Built 1965 Load: 24.5 t ADT: 56
387th Avenue
FairOver: Cain Creek
2N of Wolsey, Beadle, SD
Built 1935 Load: 24.5 t ADT: 2,600
205th Street
FairOver: Cain Creek
0.8E of Wolsey, Beadle, SD
Built 1972 Load: 24.5 t ADT: 141
389th Avenue
FairOver: Creek
0.5W & 2N of Virgil, Beadle, SD
Built 1940 Load: 24.5 t ADT: 56
196th Street
FairOver: Creek
6S & 0.1E of Hitchcock, Beadle, SD
Built 1939 Load: 24.5 t ADT: 137
219th Street
FairOver: Creek
1.1E & 5S of Virgil, Beadle, SD
Built 1930 Load: 24.5 t ADT: 56
396th Avenue
FairOver: Cain Creek
4W & 8.6S of Huron, Beadle, SD
Built 1988 Load: 24.5 t ADT: 56
398th Avenue
FairOver: Cain Creek
8.1S & 2W of Huron, Beadle, SD
Built 1978 Load: 24.5 t ADT: 56
193rd Street
FairOver: Foster Creek
15N & 2.8E of Huron, Beadle, SD
Built 1982 Load: 24.5 t ADT: 56
403rd Avenue
FairOver: James River
3E & 3.1N of Huron, Beadle, SD
Built 1975 Load: 24.5 t ADT: 163
194th Street
FairOver: Creek
1.3W & 4S of Bloomfield, Beadle, SD
Built 1940 Load: 24.5 t ADT: 56
405th Avenue
FairOver: Stony Run Creek
5E & 11.9S of Huron, Beadle, SD
Built 1939 Load: 24.5 t ADT: 93
406th Avenue
FairOver: Unnamed Creek
1.1S of Bloomfield, Beadle, SD
Built 1948 Load: 24.5 t ADT: 57
406th Avenue
FairOver: Unnamed Creek
5W & 2.8N Yale, Beadle, SD
Built 1932 Load: 24.5 t ADT: 29
409th Avenue
FairOver: Middle Pearl Creek
6.1S of Cavour, Beadle, SD
Built 1935 Load: 24.5 t ADT: 170
199TH ST
FairOver: Shue Creek
0.7E 9N Cavour, Beadle, SD
Built 1985 Load: 24.5 t ADT: 56
212th Street
FairOver: Pearl Creek
4S & 0.8E of Cavour, Beadle, SD
Built 1980 Load: 24.5 t ADT: 56
196TH St
FairOver: Shue Creek
7.5 N 0.6 W Yale, Beadle, SD
Built 1967 Load: 24.5 t ADT: 374
413th Avenue
FairOver: S. Fork of Pearl Creek
8.8S & 4E of Cavour, Beadle, SD
Built 1930 Load: 24.5 t ADT: 121
202nd Street
FairOver: Pearl Creek
1.5N & 2.1E of Yale, Beadle, SD
Built 1968 Load: 24.5 t ADT: 66
200th Street
FairOver: Pearl Creek
3.5N & 2.4E of Yale, Beadle, SD
Built 1940 Load: 24.5 t ADT: 56
Showing 1,151-1,200 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 |