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
I090 W
FairOver: WHITEWATER CK
6.3 NW SD 240 S INTERCH, Jackson, SD
Built 1986 Load: 41.9 t ADT: 3,875
I090 W
FairOver: BOXELDER CK
0.6 SE MEADE CO LINE, Pennington, SD
Built 1973 Load: 41.9 t ADT: 11,530
328TH AVENUE
FairOver: CHAPELLE CK
.3W 9.1S HOLABIRD, Hyde, SD
Built 1971 Load: 42.0 t ADT: 53
SD013
FairOver: SPRING CK
4.9 S BROOKINGS CO LINE, Moody, SD
Built 1963 Load: 42.0 t ADT: 1,135
US385
FairOver: CK
1.4 N JCT US 18 W, Fall River, SD
Built 1976 Load: 42.1 t ADT: 2,182
I029 S
FairOver: CK
0.6 N SD 30 INTERCH, Brookings, SD
Built 1970 Load: 42.2 t ADT: 4,680
I029 N
FairOver: CK
0.6 N SD 30 INTERCH, Brookings, SD
Built 1970 Load: 42.2 t ADT: 4,680
JASPER ST, HWY 104
FairOver: BIG SIOUX RIVER
2.1E & 0.2N DELL RAPIDS, Minnehaha, SD
Built 1991 Load: 42.2 t ADT: 935
246TH STREET
FairOver: PIPESTONE CREEK
7N & 0.5E GARRETSON, Minnehaha, SD
Built 1992 Load: 42.3 t ADT: 74
US018
FairOver: CK
3.8 E OGLALA LAKOTA CO LN, Bennett, SD
Built 1951 Load: 42.4 t ADT: 963
RED OWL RD.
FairOver: RED OWL CK
0.1 M1. S. RED OWL, Meade, SD
Built 2010 Load: 42.4 t ADT: 70
SD073
FairOver: CHERRY CK
8.8 N JCT SD 34, Meade, SD
Built 1985 Load: 42.4 t ADT: 745
194TH AVE
FairOver: STOCKDAM SPILLWAY
2E 2N CREIGHTON, Pennington, SD
Built 1940 Load: 42.4 t ADT: 6
SD045
FairOver: CK
1.3 SOUTH OF LEOLA, McPherson, SD
Built 1996 Load: 42.5 t ADT: 352
182 ST
FairOver: SHAEFER CK
16N & 0.4 W MILLER, Hand, SD
Built 1999 Load: 42.6 t ADT: 27
SD038
FairOver: WOLF CK
0.6 W MCCOOK CO LINE, Hanson, SD
Built 1995 Load: 42.6 t ADT: 928
US014
FairOver: CK
3.1 E JCT SD 25, Kingsbury, SD
Built 1988 Load: 42.7 t ADT: 2,437
US085
FairOver: WHITEWOOD CK
0.6 NE JCT US 385, Lawrence, SD
Built 1993 Load: 42.8 t ADT: 6,526
SD071
FairOver: HAT CK
4.0 S JCT SD 471, Fall River, SD
Built 2008 Load: 42.9 t ADT: 208
US385 NF
FairOver: FALL RV
0.1 W JCT US 385, Fall River, SD
Built 1982 Load: 42.9 t ADT: 2,758
US018 W
FairOver: CHEYENNE RV
1S JCT SD 79, Fall River, SD
Built 2010 Load: 42.9 t ADT: 1,867
US014A
FairOver: SPEARFISH CK
2.9 W & S I 90 EXIT 14, Lawrence, SD
Built 1979 Load: 43.0 t ADT: 1,854
230TH STREET
FairOver: JAMES RV
2N & 1.2E FORESTBURG, Sanborn, SD
Built 1992 Load: 43.0 t ADT: 75
US281
FairOver: BNSF RR
3.9 S JCT SD 26, Spink, SD
Built 1998 Load: 43.0 t ADT: 1,897
SD079
FairOver: CK
8 N FALL RIVER CO LINE, Custer, SD
Built 1957 Load: 43.1 t ADT: 3,672
IRR SD073
FairOver: WHITE RV
6 S OF KADOKA, Jackson, SD
Built 1996 Load: 43.1 t ADT: 1,035
ARPAN RD
FairOver: SOUTH CANAL
9.1E 4N B. FOURCHE, Butte, SD
Built 1975 Load: 43.2 t ADT: 47
US085
FairOver: BUFFALO CK
2.9 S JCT SD 20 E, Harding, SD
Built 1964 Load: 43.2 t ADT: 1,301
US083
FairOver: BAD RV
WITHIN FORT PIERRE, Stanley, SD
Built 1956 Load: 43.2 t ADT: 6,089
SD034
FairOver: FALSE BOTTOM CK
0.5 NW LAWRENCE CO LINE, Butte, SD
Built 1992 Load: 43.3 t ADT: 3,278
46530 312 ST.
FairOver: VERMILLION RV
1.6E & 5.5N VERMILLION, Clay, SD
Built 1985 Load: 43.3 t ADT: 97
LYLE ROAD
FairOver: NORTH FORK GRAND RV
10.5KM N & 1.5 W LODGEPOL, Perkins, SD
Built 2000 Load: 43.3 t ADT: 20
FDR 181
FairOver: CASTLE CREEK
T 1 N R 3 E SEC 12, Meade, SD
Built 2004 Load: 43.4 t ADT: 25
255TH STREET
FairOver: WEST PIPESTONE CREEK
6.5N & 0.2E BRANDON, Minnehaha, SD
Built 1992 Load: 43.4 t ADT: 35
FDR 181
FairOver: CASTLE CREEK
T 1 N R 4 E SEC 8, Pennington, SD
Built 2004 Load: 43.4 t ADT: 25
FDR 181
FairOver: CASTLE CREEK
T 1 N R 3 E SEC 2, Pennington, SD
Built 2004 Load: 43.4 t ADT: 25
FDR 181
FairOver: CASTLE CREEK
T 1 N R 3 E SEC 2, Pennington, SD
Built 2004 Load: 43.4 t ADT: 25
IRR I029 S
FairOver: LITTLE MINNESOTA RV
0.8 N SD 10 & I29 INTERCH, Roberts, SD
Built 1982 Load: 43.4 t ADT: 2,535
IRR I029 N
FairOver: LITTLE MINNESOTA RV
0.8 N SD 10 & I29 INTERCH, Roberts, SD
Built 1982 Load: 43.4 t ADT: 2,535
US281
FairOver: BR SAND CK
4.4 N JERAULD CO LINE, Beadle, SD
Built 1958 Load: 43.5 t ADT: 1,315
108th Street
FairOver: Creek
0.5 S & 0.3 E Herreid, Campbell, SD
Built 1971 Load: 43.5 t ADT: 288
160 STREET
FairOver: CK
.9KM N & 2.7KM W, FLORENC, Codington, SD
Built 1999 Load: 43.5 t ADT: 50
479 AVENUE
FairOver: NORTH FORK YELLOW BANK R
3.8S & 1E MILBANK, Grant, SD
Built 2010 Load: 43.5 t ADT: 52
418th Avenue
FairOver: Creek
3.0E & 3.6N of Carpenter, Clark, SD
Built 1932 Load: 43.8 t ADT: 39
SD079
FairOver: DRY CK
8 S JCT SD 36 W, Custer, SD
Built 1957 Load: 43.8 t ADT: 1,836
I029
FairOver: BR SADDLE CK
3.3 S US 18 W INTERCH, Lincoln, SD
Built 1960 Load: 43.8 t ADT: 14,270
SD034
FairOver: WEST FORK VERMILLION RV
6.3 W JCT US 81, Miner, SD
Built 1987 Load: 43.8 t ADT: 1,777
254TH ST, HWY 122
FairOver: SKUNK CK
1.4 S & 0.8W LYONS, Minnehaha, SD
Built 1997 Load: 43.8 t ADT: 611
488TH AVENUE
FairOver: SPLIT ROCK CREEK
1E & 0.2S SHERMAN, Minnehaha, SD
Built 1974 Load: 43.8 t ADT: 20
259TH STREET
FairOver: SPLIT ROCK CREEK
0.3W & 1N CORSON, Minnehaha, SD
Built 1981 Load: 43.9 t ADT: 72
Showing 2,651-2,700 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 |