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
458 AVE
FairOver: BATTLE CK
6.2S & 2.0W NUNDA, Lake, SD
Built 1935 Load: 24.5 t ADT: 91
240 ST
FairOver: BUFFALO CK
5.6W & 1N CHESTER, Lake, SD
Built 1955 Load: 24.5 t ADT: 65
461 AVE
FairOver: BATTLE CK
1E & 6.6S NUNDA, Lake, SD
Built 1935 Load: 24.5 t ADT: 65
461 AVE
FairOver: BUFFALO CK
3W CHESTER, Lake, SD
Built 1955 Load: 24.5 t ADT: 260
229 ST
FairOver: BATTLE CK
1.5S & 0.4W RUTLAND, Lake, SD
Built 1947 Load: 24.5 t ADT: 45
228 ST
FairOver: BATTLE CK
0.6S & 0.2E RUTLAND, Lake, SD
Built 1941 Load: 24.5 t ADT: 183
227 ST
FairOver: BATTLE CK
1.2E & 0.4N RUTLAND, Lake, SD
Built 1985 Load: 24.5 t ADT: 45
225 ST
FairOver: BATTLE CK
2.5E & 2.0N RUTLAND, Lake, SD
Built 1985 Load: 24.5 t ADT: 45
224 ST
FairOver: CK
4.9E & 1S NUNDA, Lake, SD
Built 1984 Load: 24.5 t ADT: 65
465 AVE
FairOver: CK
5E & 0.8S NUNDA, Lake, SD
Built 1935 Load: 24.5 t ADT: 91
465 AVE
FairOver: BATTLE CK
5E & 0.9S NUNDA, Lake, SD
Built 1935 Load: 24.5 t ADT: 91
HOMESTAKE ROAD
FairOver: HIGGINS GULCH
1W JCT US85, Lawrence, SD
Built 1940 Load: 24.5 t ADT: 2,000
NEMO ROAD
FairOver: ELK CK
AT ROUBAIX, Lawrence, SD
Built 1957 Load: 24.5 t ADT: 389
NEMO ROAD
FairOver: BOXELDER CK
4.5 SE NEMO, Lawrence, SD
Built 1954 Load: 24.5 t ADT: 438
464th Avenue
FairOver: Long Creek
0.5N & 2W of Lennox, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 45
291st Street
FairOver: Trib. to Vermillion Rvr
4N & 2.3E of Centerville, Lincoln, SD
Built 1967 Load: 24.5 t ADT: 278
280th Street
FairOver: Long Creek
1S of Lennox, Lincoln, SD
Built 1966 Load: 24.5 t ADT: 425
281st Street
FairOver: Long Creek
2S & 0.8W of Lennox, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 50
466th Avenue
FairOver: Trib. to Beaver Creek
5.3N of Lennox, Lincoln, SD
Built 1947 Load: 24.5 t ADT: 3,277
466th Avenue
FairOver: Beaver Creek
3.6N of Lennox, Lincoln, SD
Built 1948 Load: 24.5 t ADT: 3,277
283rd Street
FairOver: Long Creek
4S & 0.3E of Lennox, Lincoln, SD
Built 1989 Load: 24.5 t ADT: 65
294th Street
FairOver: Tributary to Blind Creek
3N & 5.2W of Beresford, Lincoln, SD
Built 1986 Load: 24.5 t ADT: 250
467th Avenue
FairOver: Tributary to Blink Creek
4W & 3.1N Beresford, Lincoln, SD
Built 1950 Load: 24.5 t ADT: 25
467th Avenue
FairOver: Tributary to Blind Creek
4W & 2.7N of Beresford, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 25
288th Street
FairOver: Snake Creek
9S & 1.7E of Lennox, Lincoln, SD
Built 1964 Load: 24.5 t ADT: 78
468th Avenue
FairOver: Saddle Creek
9.1S & 2E of Lennox, Lincoln, SD
Built 1963 Load: 24.5 t ADT: 80
468th Avenue
FairOver: Trib. to Saddle Creek
9.5S & 2E of Lennox, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 80
468th Avenue
FairOver: Haram Creek
9.8S & 2E of Lennox, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 50
289th Street
FairOver: Haram Creek
10S & 2.3E of Lennox, Lincoln, SD
Built 1945 Load: 24.5 t ADT: 15
469th Avenue
FairOver: Beaver Creek
1.6N & 3E of Lennox, Lincoln, SD
Built 1950 Load: 24.5 t ADT: 100
469th Avenue
FairOver: Harem Creek
10.5S & 3E of Lennox, Lincoln, SD
Built 1947 Load: 24.5 t ADT: 135
469th Avenue
FairOver: Tributary to Blind Creek
2W & 1.6N of Beresford, Lincoln, SD
Built 1950 Load: 24.5 t ADT: 99
470th Avenue
FairOver: Saddle Creek
8.7S & 4E of Lennox, Lincoln, SD
Built 1969 Load: 24.5 t ADT: 50
470th Avenue
FairOver: Trib. to Saddle Creek
9.1S & 4E of Lennox, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 50
470th Avenue
FairOver: Harem Creek
11.1S & 4E of Lennox, Lincoln, SD
Built 1963 Load: 24.5 t ADT: 50
284th Street
FairOver: Snake Creek
4S & 1.2W of Worthing, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 60
471st Avenue
FairOver: Beaver Creek
2.2N & 1W of Worthing, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 60
471st Avenue
FairOver: Trib. to Saddle Creek
1W & 8.4S of Worthing, Lincoln, SD
Built 1963 Load: 24.5 t ADT: 45
278th Street
FairOver: Beaver Creek
2N & 0.9W of Worthing, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 50
472nd Avenue
FairOver: Snake Creek
4.0S of Worthing, Lincoln, SD
Built 1938 Load: 24.5 t ADT: 150
473rd Avenue
FairOver: Beaver Creek
1.2N & 1E of Worthing, Lincoln, SD
Built 1985 Load: 24.5 t ADT: 45
473rd Avenue
FairOver: Saddle Creek
1E & 8.1S of Worthing, Lincoln, SD
Built 1982 Load: 24.5 t ADT: 45
474th Avenue
FairOver: Saddle Creek
2E & 8.6S of Worthing, Lincoln, SD
Built 1978 Load: 24.5 t ADT: 75
294th Street
FairOver: West Brule Creek
4.7W of Norway Center, Lincoln, SD
Built 1947 Load: 24.5 t ADT: 199
279th Street
FairOver: Beaver Creek
1N & 2.4E of Worthing, Lincoln, SD
Built 1982 Load: 24.5 t ADT: 75
286th Street
FairOver: Trib S Fork Beaver Creek
3.8E & 6S Worthing, Lincoln, SD
Built 1944 Load: 24.5 t ADT: 60
475th Avenue
FairOver: Beaver Creek
0.8N & 3E of Worthing, Lincoln, SD
Built 1981 Load: 24.5 t ADT: 60
475th Avenue
FairOver: Trib S Fork Beaver Creek
3E & 6.4S Worthing, Lincoln, SD
Built 1950 Load: 24.5 t ADT: 60
274th Street
FairOver: Nine Mile Creek
1S & 0.3E of Harrisburg, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 60
287th Street
FairOver: S Fork of Beaver Creek
7S & 3.4E of Worthing, Lincoln, SD
Built 1940 Load: 24.5 t ADT: 60
Showing 1,451-1,500 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 |