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
SD020
FairOver: CK
1.4 W JCT SD 47 N, Potter, SD
Built 1952 Load: 43.9 t ADT: 184
SD044
FairOver: OAK CK
2.7 W TRIPP CO LINE, Mellette, SD
Built 1989 Load: 44.0 t ADT: 318
IRR I029 S
FairOver: DRAINAGE DITCH
5.5 NE SD 10 INTERCH, Roberts, SD
Built 1980 Load: 44.1 t ADT: 2,535
IRR I029 N
FairOver: DRAINAGE DITCH
5.5 NE SD 10 INTERCH, Roberts, SD
Built 1980 Load: 44.1 t ADT: 2,535
US281 S
FairOver: MOCCASIN CK
8.8 S JCT US 12, Brown, SD
Built 1972 Load: 44.3 t ADT: 1,836
US281 N
FairOver: MOCCASIN CK
8.8 S JCT US 12, Brown, SD
Built 1971 Load: 44.3 t ADT: 1,836
US014
FairOver: NORTH FORK BAD RV
1.0 SW OF PHILIP, Haakon, SD
Built 1995 Load: 44.3 t ADT: 1,015
US014A
FairOver: BEAR BUTTE CK
3.5 W I 90 INTERCH, Lawrence, SD
Built 2000 Load: 44.3 t ADT: 6,096
IRR SD1806
FairOver: CEDAR CK
6.4 NW JCT SD 273, Lyman, SD
Built 1997 Load: 44.3 t ADT: 115
US014A
FairOver: BEAR BUTTE CK
0.1 E LAWRENCE CO LINE, Meade, SD
Built 2000 Load: 44.3 t ADT: 6,096
WEST MAIN ST.
FairOver: RAPID CK
0.3 W JCT SD 44 - RC, Pennington, SD
Built 1975 Load: 44.3 t ADT: 20,745
SD034 E
FairOver: PARK CK
0.4 NW JCT SD 19, Lake, SD
Built 1977 Load: 44.4 t ADT: 3,770
US085
FairOver: WHITEWOOD CK
0.8 NE JCT US 385, Lawrence, SD
Built 1993 Load: 44.4 t ADT: 6,526
262ND ST, HWY 138
FairOver: BEAVER CREEK
0.5E VALLEY SPRINGS, Minnehaha, SD
Built 1989 Load: 44.4 t ADT: 1,006
SD040
FairOver: BATTLE CK
2.4 W JCT SD 79, Custer, SD
Built 1974 Load: 44.5 t ADT: 980
FORT RANDALL ROAD
FairOver: RANDALL CK
0.6S FT RANDALL DAM, Gregory, SD
Built 1985 Load: 44.5 t ADT: 36
391 AVE
FairOver: SAND CK
2.6S 1.3W ALPENA, Jerauld, SD
Built 2002 Load: 44.5 t ADT: 60
SD040
FairOver: BATTLE CK
1.7 E JCT US 16A, Pennington, SD
Built 1974 Load: 44.5 t ADT: 995
US014 E
FairOver: BIG SIOUX RV
1.9 E OF VOLGA, Brookings, SD
Built 1978 Load: 44.6 t ADT: 4,096
US012
FairOver: PREACHERS RUN CK
6.7 E OF IPSWICH, Edmunds, SD
Built 1974 Load: 44.6 t ADT: 3,599
US012
FairOver: BNSF RR
0.5 E OF ROSCOE, Edmunds, SD
Built 2006 Load: 44.7 t ADT: 2,236
SD079
FairOver: MOREAU RV
21.4 S JCT SD 20, Harding, SD
Built 1964 Load: 44.7 t ADT: 378
SD079
FairOver: SPRING CK
6.6 N CUSTER CO LINE, Pennington, SD
Built 1997 Load: 44.7 t ADT: 8,798
I029
FairOver: CK
4.6 S US 14 INTERCH, Brookings, SD
Built 1966 Load: 44.8 t ADT: 12,240
SD073
FairOver: NORTH BR WILLOW CK
5.4 S HAAKON CO LINE, Jackson, SD
Built 1961 Load: 44.8 t ADT: 751
I090 E
FairOver: BOXELDER CK
0.6 SE MEADE CO LINE, Pennington, SD
Built 1959 Load: 44.8 t ADT: 11,530
US014 E
FairOver: BIG SIOUX RV OVERFLOW
2.5 E OF VOLGA, Brookings, SD
Built 1978 Load: 44.9 t ADT: 4,096
IRR SD1806
FairOver: STRAIGHT CK
6.7 NW JCT SD 273, Lyman, SD
Built 1997 Load: 44.9 t ADT: 115
US014
FairOver: CAIN CK
2 NW OF WOLSEY, Beadle, SD
Built 1980 Load: 45.0 t ADT: 2,125
US016A
FairOver: GRACE COOLIDGE CK
4.4 E JCT SD 87 N, Custer, SD
Built 1977 Load: 45.0 t ADT: 1,335
105 St
FairOver: BOIS DE SIOUX R
7 MILES E. OF ROSHOLT, SD, Roberts, SD
Built 1930 Load: 45.0 t ADT: 200
485TH AVENUE
FairOver: CK
1.7N & 1W ELKTON, Brookings, SD
Built 1990 Load: 45.1 t ADT: 92
SD038
FairOver: SKUNK CK
0.6 SE I90 & SD38 INTERCH, Minnehaha, SD
Built 1986 Load: 45.1 t ADT: 3,892
US014
FairOver: CK
6.2 E JCT SD 37, Beadle, SD
Built 1965 Load: 45.2 t ADT: 1,883
477TH AVENUE
FairOver: CK
6E & 5.4N BROOKINGS, Brookings, SD
Built 2009 Load: 45.2 t ADT: 92
SD034
FairOver: BELLE FOURCHE RV
17.6 NE JCT SD79 N, Meade, SD
Built 1998 Load: 45.2 t ADT: 847
SD044
FairOver: COTTONWOOD CK
1.7 W JCT US 183, Tripp, SD
Built 1988 Load: 45.2 t ADT: 312
SD044
FairOver: CK
5.2 SE JCT US16B & SD44, Pennington, SD
Built 1950 Load: 45.3 t ADT: 2,350
STATE PARK RD
FairOver: Grace Coolidge Creek
10.9 E & 1.1 S Custer, Custer, SD
Built 1950 Load: 45.4 t ADT: 5
US212
FairOver: CK
1.9 N JCT SD 15 S, Deuel, SD
Built 1971 Load: 45.4 t ADT: 2,115
HILLSVIEW ROAD
FairOver: SPEARFISH CK
HILLSVIEW ROAD-SPEARFISH, Lawrence, SD
Built 1986 Load: 45.4 t ADT: 200
US014 E
FairOver: BIG SIOUX RV OVERFLOW
2.4 E OF VOLGA, Brookings, SD
Built 1978 Load: 45.5 t ADT: 4,096
US012
FairOver: CK
0.4 SE JCT SD 123, Grant, SD
Built 1997 Load: 45.5 t ADT: 1,722
47659 320 ST.
FairOver: BRULE CK
4.0N & 0.7E ELK POINT, Union, SD
Built 2005 Load: 45.5 t ADT: 15
US018
FairOver: ANGOSTURA MAIN CANAL
3 S JCT SD 79, Fall River, SD
Built 1956 Load: 45.6 t ADT: 1,782
I029 N
FairOver: BNSF RR
0.6 N SD 44 INTERCH, Lincoln, SD
Built 2001 Load: 45.6 t ADT: 12,340
SD027
FairOver: CROW CK
2.3 S JCT SD 10, Marshall, SD
Built 1977 Load: 45.6 t ADT: 714
20TH AVE. S, WTN.
FairOver: WILLOW CK
1.0S&1.2E WATERTOWN, Codington, SD
Built 2010 Load: 45.7 t ADT: 60
SD047
FairOver: CK
9.2 N JCT US 14, Hyde, SD
Built 1964 Load: 45.7 t ADT: 262
US014A
FairOver: DRAW
0.5 NE JCT 85/14A, Lawrence, SD
Built 1999 Load: 45.7 t ADT: 5,676
Showing 2,701-2,750 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 |