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
45108 Bluff Road
FairOver: Turkey Creek
0.1 E Volin, Yankton, SD
Built 1956 Load: 24.5 t ADT: 400
45120 301 ST
FairOver: Turkey Creek
5.3 N & 0.2 E Volin, Yankton, SD
Built 1970 Load: 24.5 t ADT: 60
45130 305 ST
FairOver: Turkey Creek
1 N & 0.3 E Volin, Yankton, SD
Built 1989 Load: 24.5 t ADT: 60
45170 305 ST
FairOver: Trib. to Turkey Creek
1 N & 0.7 E Volin, Yankton, SD
Built 1989 Load: 24.5 t ADT: 60
IRR BIA RTE 6
FairOver: RED SCAFFOLD CREEK
IN RED SCAFFOLD, Ziebach, SD
Built 1960 Load: 24.5 t ADT: 165
LEEDOM PIKE RD
FairOver: MOREAU RV
1.5E & 0.7N THUNDER BUTTE, Ziebach, SD
Built 1993 Load: 24.5 t ADT: 20
241st Street
FairOver: Medicine Creek
5.7E of Presho, Lyman, SD
Built 1930 Load: 24.6 t ADT: 55
484TH AVE, HWY 109
FairOver: FOUR MILE CREEK
3W & 2.3S VALLEY SPRINGS, Minnehaha, SD
Built 1962 Load: 24.6 t ADT: 1,085
SD075
FairOver: NORTH FORK GRAND RV
5.5 N OF LODGEPOLE, Perkins, SD
Built 1952 Load: 24.6 t ADT: 356
THUNDER BUTTE ROAD
FairOver: MOREAU RV
11.2 N 4.2 W DUPREE, Ziebach, SD
Built 1969 Load: 24.6 t ADT: 143
204TH STREET
FairOver: NORTH DEER CK
2.3E & 1S BRUCE, Brookings, SD
Built 1962 Load: 24.7 t ADT: 735
164TH STREET
FairOver: TIMBER CREEK
8N & 4.5W DOLAND, Spink, SD
Built 1935 Load: 24.7 t ADT: 9
48310 303RD ST
FairOver: CK
1.5S & 4.1E ALCESTER, Union, SD
Built 1982 Load: 24.7 t ADT: 45
SD044
FairOver: RAPID CK
1.9 SW JCT SD 231, Pennington, SD
Built 1962 Load: 24.8 t ADT: 12,216
US012 WF
FairOver: CK
4.5 W JCT US 83, Walworth, SD
Built 1965 Load: 24.8 t ADT: 1,374
I029
FairOver: BR SIX MILE CK
1.8 N US14 BY-PASS, Brookings, SD
Built 1970 Load: 24.9 t ADT: 9,960
4th Avenue SW
FairOver: Big Sioux River
0.3E of 10th Street SW, Codington, SD
Built 1977 Load: 24.9 t ADT: 1,831
UPPER FRENCH CK RD
FairOver: RUBY CK
2.8W CUSTER, Custer, SD
Built 1973 Load: 24.9 t ADT: 40
UPPER FRENCH CK RD
FairOver: RUBY CK
2.2W & 0.5S CUSTER, Custer, SD
Built 1973 Load: 24.9 t ADT: 40
RIVERSIDE ROAD
FairOver: CHEYENNE RV
11.7E & 0.8N BUFFALO GAP, Custer, SD
Built 2014 Load: 24.9 t ADT: 100
IRR COUNTY ROAD
FairOver: Creek
7.0W 9.0S TIMBER LK, Dewey, SD
Built 1960 Load: 24.9 t ADT: 38
479 AVE
FairOver: NORTH FORK WHETSTONE RV
4.7N & 1.1E MILBANK, Grant, SD
Built 1993 Load: 24.9 t ADT: 52
482 AVE
FairOver: CK
4.1S OF ALBEE, Grant, SD
Built 1901 Load: 24.9 t ADT: 290
2nd St. in Presho
FairOver: Medicine Creek
East Edge of Presho, Lyman, SD
Built 1920 Load: 24.9 t ADT: 55
OLD212 KILLDEER RD
FairOver: LOTTIE CREEK
5 S MUD BUTTE, Meade, SD
Built 1952 Load: 24.9 t ADT: 15
455th Avenue
FairOver: BNSF Railroad
0.3S of Jct with US 12, Roberts, SD
Built 1940 Load: 24.9 t ADT: 2,500
41030 309th Street
FairOver: Emanuel Creek
3.7N&4.7W of Springfield, Bon Homme, SD
Built 1962 Load: 25.0 t ADT: 163
I090 W
FairOver: DEADMAN GULCH
0.3 NW STURGIS INTERCH, Meade, SD
Built 1963 Load: 25.0 t ADT: 10,470
I090 E
FairOver: DEADMAN GULCH
0.3 NW STURGIS INTERCH, Meade, SD
Built 1963 Load: 25.0 t ADT: 10,470
MYSTIC ROAD
FairOver: CASTLE CK
0.8W 1.35 MYSTIC, Pennington, SD
Built 1984 Load: 25.0 t ADT: 256
THUNDERHEAD FALLS
FairOver: RAPID CK
0.9E 1.6S JOHNSON SD, Pennington, SD
Built 1972 Load: 25.0 t ADT: 218
US014
FairOver: CAIN CK
2.5 MI SE WOLSEY, Beadle, SD
Built 1976 Load: 25.1 t ADT: 2,817
SD025
FairOver: CK
3.7 S OF SCOTLAND, Bon Homme, SD
Built 1920 Load: 25.1 t ADT: 888
US014
FairOver: CK
6.2 E I 29 INTERCH, Brookings, SD
Built 1996 Load: 25.1 t ADT: 2,258
US014
FairOver: CK
9.4 E I 29 INTERCH, Brookings, SD
Built 1996 Load: 25.1 t ADT: 2,258
US212
FairOver: CK
1.2 NE OF NEWELL, Butte, SD
Built 1956 Load: 25.1 t ADT: 494
IRR SD050
FairOver: GARDEN CK
0.8 W JCT US 18 & 281, Charles Mix, SD
Built 1941 Load: 25.1 t ADT: 594
Old IRR SD050
FairOver: CK
1.0 NW OF WAGNER, Charles Mix, SD
Built 1940 Load: 25.1 t ADT: 1,329
US016A
FairOver: GRACE COOLIDGE CK
1.1 W JCT SD 36, Custer, SD
Built 1927 Load: 25.1 t ADT: 1,335
SD028
FairOver: CK
1.1 W JCT SD 15, Deuel, SD
Built 1941 Load: 25.1 t ADT: 2,161
SD028
FairOver: CK
0.2 W JCT SD 15, Deuel, SD
Built 1941 Load: 25.1 t ADT: 2,161
US018
FairOver: LONE WELL CK
0.1 N JCT US 385 S, Fall River, SD
Built 1956 Load: 25.1 t ADT: 1,782
US014
FairOver: CK
1.7 E OF PHILIP, Haakon, SD
Built 1954 Load: 25.1 t ADT: 725
US018
FairOver: SOUTH BR LONETREE CK
3.5 E JCT SD 37, Hutchinson, SD
Built 1940 Load: 25.1 t ADT: 723
SD025
FairOver: CK
0.6 N BON HOMME CO LINE, Hutchinson, SD
Built 1940 Load: 25.1 t ADT: 725
IRR SD073
FairOver: CK
7.7 S OF KADOKA, Jackson, SD
Built 1954 Load: 25.1 t ADT: 1,035
SD010
FairOver: CROW CK
2.9 E BRITTON, Marshall, SD
Built 1942 Load: 25.1 t ADT: 1,337
SD034
FairOver: CK
14.6 NE JCT SD 79 N, Meade, SD
Built 1956 Load: 25.1 t ADT: 818
US212
FairOver: CK
0.2 NE BUTTE CO LINE, Meade, SD
Built 1956 Load: 25.1 t ADT: 494
SD034
FairOver: CK
6.2 W OF UNION CENTER, Meade, SD
Built 1956 Load: 25.1 t ADT: 945
Showing 1,751-1,800 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 |