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
SD015
FairOver: SOUTH FORK WHETSTONE RV
0.7 N JCT US 12, Grant, SD
Built 1982 Load: 48.7 t ADT: 1,819
IRR US012
FairOver: DRY RUN CK
0.7 W JCT SD 63, Corson, SD
Built 1964 Load: 48.8 t ADT: 402
SD040
FairOver: BATTLE CK
0.7 E JCT US 16A, Pennington, SD
Built 1974 Load: 48.8 t ADT: 1,110
SD020
FairOver: CK
0.8 S JCT SD 45N, Faulk, SD
Built 1975 Load: 48.9 t ADT: 711
US018
FairOver: RED CANYON CK
3 NE OF EDGEMONT, Fall River, SD
Built 1980 Load: 49.0 t ADT: 2,290
154 STREET
FairOver: BIG SIOUX RV OVERFLOW
3N & 12.8W S SHORE, Grant, SD
Built 1992 Load: 49.0 t ADT: 52
IRR SD010
FairOver: CK
0.7 W JCT SD 127 N, Roberts, SD
Built 1979 Load: 49.0 t ADT: 6,170
IRR I029
FairOver: INDIAN RV
4.6 N CODINGTON CO LINE, Grant, SD
Built 1976 Load: 49.1 t ADT: 6,600
US018
FairOver: WEST COTTONWOOD CK
2.5 W JCT SD 53, Tripp, SD
Built 1988 Load: 49.2 t ADT: 1,053
US018
FairOver: SAND CK
2 SE OF WINNER, Tripp, SD
Built 1973 Load: 49.3 t ADT: 2,071
US012
FairOver: CK
2.5 E JCT SD 37, Brown, SD
Built 1972 Load: 49.4 t ADT: 3,468
West 12th Street
FairOver: Trib. to Skunk Creek
0.3W of Sertoma Avenue, Minnehaha, SD
Built 1989 Load: 49.4 t ADT: 8,892
US014
FairOver: CAIN CK
3.5 E HAND CO LINE, Beadle, SD
Built 1979 Load: 49.6 t ADT: 1,396
US014 W
FairOver: BIG SIOUX RV
1.9 MI EAST OF VOLGA, Brookings, SD
Built 2001 Load: 49.6 t ADT: 4,096
SD011
FairOver: SPLIT ROCK CK
1.2 S GARRETSON, Minnehaha, SD
Built 2005 Load: 49.6 t ADT: 3,286
141st Street
FairOver: Mud Creek
1N & 2.7W of Ferney, Brown, SD
Built 2010 Load: 49.7 t ADT: 98
SD049
FairOver: MOCCASIN CK
1 S OF HAMILL, Tripp, SD
Built 1973 Load: 49.8 t ADT: 509
US014 W
FairOver: NORTH DEER CK OVERFLOW
4.1 MI EAST OF VOLGA, Brookings, SD
Built 2001 Load: 49.9 t ADT: 4,096
470 AVE
FairOver: NORTH FORK WHETSTONE TRB
5.5E & 4.0N MARVIN, Grant, SD
Built 2005 Load: 49.9 t ADT: 25
SD045
FairOver: CK
3.3 SOUTH OF LEOLA, McPherson, SD
Built 1996 Load: 49.9 t ADT: 352
FAS 8521
FairOver: BAD RV
9 E 0.5 S PHILIP, Haakon, SD
Built 1970 Load: 50.1 t ADT: 35
SD324
FairOver: MEDARY CK
0.8 E I 29 INTERCH, Brookings, SD
Built 1974 Load: 50.2 t ADT: 1,295
151 AVE
FairOver: WOLF CK
6.0N & 10.0W MILLER, Hand, SD
Built 2003 Load: 50.2 t ADT: 20
US016
FairOver: FRENCH CK
0.3 W JCT US 385 S, Custer, SD
Built 1974 Load: 50.3 t ADT: 3,492
SD021
FairOver: DOLPH CK
0.2 N JCT SD 28, Hamlin, SD
Built 1985 Load: 50.4 t ADT: 809
SD020
FairOver: BRUSH CK
3.5 W OF BUFFALO, Harding, SD
Built 1975 Load: 50.4 t ADT: 132
SD020
FairOver: RUSH CK
0.9 W OF BUFFALO, Harding, SD
Built 1975 Load: 50.4 t ADT: 402
SD045
FairOver: WOLF CK
7.2 N JCT US 14, Hand, SD
Built 2002 Load: 50.8 t ADT: 954
US083
FairOver: MEDICINE CK
0.6 N JCT SD 248, Lyman, SD
Built 2003 Load: 50.8 t ADT: 2,284
YELLOW CREEK ROAD
FairOver: WHITEWOOD CK
0.5 SOUTH OF LEAD, Lawrence, SD
Built 1979 Load: 50.9 t ADT: 69
SD048
FairOver: BIG SIOUX RV
SD/IA BORDER - AKRON, Union, SD
Built 1996 Load: 50.9 t
SD038
FairOver: CK
0.4 NW I 90 INTERCH, Minnehaha, SD
Built 1949 Load: 51.0 t ADT: 4,025
SD015
FairOver: HIDEWOOD CK
1.1 S JCT SD 22, Deuel, SD
Built 1994 Load: 51.1 t ADT: 1,475
US014 W
FairOver: BIG SIOUX RV OVERFLOW
1.7 MI EAST OF VOLGA, Brookings, SD
Built 2001 Load: 51.2 t ADT: 4,096
US014 W
FairOver: BIG SIOUX RV OVERFLOW
2.5 MI EAST OF VOLGA, Brookings, SD
Built 2001 Load: 51.2 t ADT: 4,096
US014
FairOver: CAIN CK
0.5 E HAND CO LINE, Beadle, SD
Built 1979 Load: 51.3 t ADT: 1,396
US012 E
FairOver: JAMES RV
11 E JCT US 281 N, Brown, SD
Built 1994 Load: 51.3 t ADT: 2,783
US085
FairOver: SAND CK
17 S JCT SD 20 E, Harding, SD
Built 1974 Load: 51.4 t ADT: 1,223
US083
FairOver: SWAN CK
4.3 N POTTER CO LINE, Walworth, SD
Built 2005 Load: 51.4 t ADT: 731
US014
FairOver: CAIN CK
0.6 W JCT US 281, Beadle, SD
Built 1985 Load: 51.5 t ADT: 1,396
US012 W
FairOver: FOOT CK
0.7 W JCT US 281 S, Brown, SD
Built 1970 Load: 51.5 t ADT: 3,618
US012 E
FairOver: FOOT CK
0.7 W JCT US 281 S, Brown, SD
Built 1970 Load: 51.5 t ADT: 3,618
US018
FairOver: CK
5 SE OF WINNER, Tripp, SD
Built 1973 Load: 51.5 t ADT: 1,819
VALE CUTOFF RD
FairOver: WHITEWOOD CK
3.2 W .2N VALE, Butte, SD
Built 1966 Load: 51.8 t ADT: 65
I090 W
FairOver: CROW CK
1.7 E WYOMING LINE, Lawrence, SD
Built 1974 Load: 51.9 t ADT: 3,745
I090 E
FairOver: CROW CK
1.7 E WYOMING LINE, Lawrence, SD
Built 1974 Load: 51.9 t ADT: 3,745
SD040
FairOver: BATTLE CK
1.4 E JCT US 16A, Pennington, SD
Built 1974 Load: 51.9 t ADT: 1,110
SD040
FairOver: BATTLE CK
2.6 E JCT US 16A, Pennington, SD
Built 1974 Load: 51.9 t ADT: 995
US016
FairOver: FRENCH CK
1.3 W JCT US 385 S, Custer, SD
Built 1974 Load: 52.0 t ADT: 3,492
US085
FairOver: CROOKED CK
2.9 S NORTH DAKOTA LINE, Harding, SD
Built 1973 Load: 52.1 t ADT: 1,100
Showing 2,801-2,850 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 |