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
US016
FairOver: SPRING CK
3.1 N CUSTER CO LINE, Pennington, SD
Built 1998 Load: 91.4 t ADT: 7,034
US016
FairOver: SPRING CK
3.0 N OF CUSTER CO LINE, Pennington, SD
Built 1998 Load: 91.6 t ADT: 7,034
SD046
FairOver: CK
11.9 E OF BERESFORD, Union, SD
Built 1954 Load: 91.9 t ADT: 1,852
SD079
FairOver: ELM CK
1.3 S CUSTER CO LINE, Fall River, SD
Built 2006 Load: 93.2 t ADT: 4,214
24470 422 AVE.
FairOver: ROCK CK
3 E & 7.3 N FULTON, Hanson, SD
Built 2008 Load: 93.4 t ADT: 15
SD158
FairOver: CK
1.2 W MINNESOTA LINE, Grant, SD
Built 1966 Load: 94.5 t ADT: 270
SD079
FairOver: CK
8.9 NE JCT SD 168, Butte, SD
Built 1983 Load: 95.9 t ADT: 388
303rd Avenue
FairOver: Creek
4.6S of Akaska, Walworth, SD
Built 1998 Load: 97.0 t ADT: 99
US081
FairOver: EAST FORK VERMILLION RV
2.2 E MINER CO LINE, Lake, SD
Built 1983 Load: 98.4 t ADT: 1,744
IRR I029
FairOver: HINES CK
0.3 N PEEVER INTERCH, Roberts, SD
Built 1978 Load: 98.7 t ADT: 4,890
IRR I029
FairOver: CK
4.2 S PEEVER INTERCH, Roberts, SD
Built 1978 Load: 99.4 t ADT: 5,340
I029 NF
FairOver: CK
2 N I29 & SD 324 INTERCH, Brookings, SD
Built 1967 Load: 99.7 t ADT: 410
US212, SER RD
FairOver: CK
1.9 E JCT US 81, Codington, SD
Built 1970 Load: 99.7 t ADT: 12,968
I029
FairOver: DEER CK
0.8 S SD 28 INTERCH, Deuel, SD
Built 1971 Load: 99.7 t ADT: 7,560
101st Street
FairOver: Maple River
6.3N & 2.4E of Frederick, Brown, SD
Built 2007 Load: 99.9 t ADT: 98
SD034
FairOver: WILLOW CK
0.7 E JCT US 85, Butte, SD
Built 1939 Load: 99.9 t ADT: 3,661
SD1804
FairOver: OAHE RESERVOIR LK
2.7 NW OF POLLOCK, Campbell, SD
Built 1980 Load: 99.9 t ADT: 168
SD045
FairOver: CK
1.6 S BRULE CO LINE, Charles Mix, SD
Built 1948 Load: 99.9 t ADT: 963
IRR SD046
FairOver: CK
0.9 E OF WAGNER, Charles Mix, SD
Built 1968 Load: 99.9 t ADT: 1,273
IRR US012
FairOver: CK
3.1 E JCT SD 65 S, Corson, SD
Built 1964 Load: 99.9 t ADT: 402
US016A
FairOver: GRACE COOLIDGE CK
5.5 E JCT SD 87 N, Custer, SD
Built 1988 Load: 99.9 t ADT: 1,335
142nd Street
FairOver: Creek
8S & 2E of Ipswich, Edmunds, SD
Built 2009 Load: 99.9 t ADT: 209
126th Street
FairOver: Creek
8N & 5.4E of Craven Cor, Edmunds, SD
Built 2004 Load: 99.9 t ADT: 25
US018
FairOver: CK
4.4 E JCT US 385 S, Fall River, SD
Built 1952 Load: 99.9 t ADT: 676
SD123
FairOver: CK
0.8 S ROBERTS CO LINE, Grant, SD
Built 1988 Load: 99.9 t ADT: 276
US012
FairOver: CK
1.9 SE JCT SD 123, Grant, SD
Built 1997 Load: 99.9 t ADT: 1,722
347 AVENUE
FairOver: CK
7.6S & 3E BURKE, Gregory, SD
Built 1988 Load: 99.9 t ADT: 36
US014
FairOver: CK
10.3 E OF PHILIP, Haakon, SD
Built 1994 Load: 99.9 t ADT: 725
US014
FairOver: CK
12.6 E OF PHILIP, Haakon, SD
Built 1994 Load: 99.9 t ADT: 725
Manilla Road
FairOver: PLUM CK
2.9W 8.9 S KIRLEY, Haakon, SD
Built 1975 Load: 99.9 t ADT: 28
US014
FairOver: MUD CK
4.1 W OF MIDLAND, Haakon, SD
Built 1994 Load: 99.9 t ADT: 678
SD045
FairOver: CAMPBELL CK
2.1 S FAULK CO LINE, Hand, SD
Built 2002 Load: 99.9 t ADT: 575
SD045
FairOver: SHAEFER CK
2.2 S JCT SD 26 E, Hand, SD
Built 2002 Load: 99.9 t ADT: 954
176 ST
FairOver: CK
21 N & 5.7 E MILLER, Hand, SD
Built 2013 Load: 99.9 t ADT: 43
US014
FairOver: CAIN CK
0.2 W BEADLE CO LINE, Hand, SD
Built 1996 Load: 99.9 t ADT: 1,373
42890 257 STREET
FairOver: WOLF CK
4.0 N & 0.1 W EMERY, Hanson, SD
Built 2010 Load: 99.9 t ADT: 15
26920 409 AVE.
FairOver: SOUTH FORK TWELVE MILE C
6.8N,1.0W PARKSTON, Hutchinson, SD
Built 1977 Load: 99.9 t ADT: 10
41250 277 STR.
FairOver: NORTH BR DRY CK
1 S 1.5 E PARKSTON, Hutchinson, SD
Built 1987 Load: 99.9 t ADT: 14
43070 283 ST
FairOver: FURLONG CK
3.0N 0.3W OF MENNO, Hutchinson, SD
Built 2017 Load: 99.9 t ADT: 20
SWIFT HORSE ROAD
FairOver: PASS CK
6N & 9E WANBLEE, Jackson, SD
Built 1999 Load: 99.9 t ADT: 17
US014A
FairOver: WHITEWOOD CK
0.4 E JCT US 85, Lawrence, SD
Built 1986 Load: 99.9 t ADT: 6,249
480th Avenue
FairOver: Lake Alvin Outlet
0.5N & 4.5E of Harrisburg, Lincoln, SD
Built 1990 Load: 99.9 t ADT: 805
US083
FairOver: CK
5.4 N JCT SD 248, Lyman, SD
Built 2003 Load: 99.9 t ADT: 2,284
SD027
FairOver: CK
3.3 E OF LANGFORD, Marshall, SD
Built 1980 Load: 99.9 t ADT: 727
I090
FairOver: ALKALI CK
0.5 NW B.H. NATL CEMETARY, Meade, SD
Built 1947 Load: 99.9 t ADT: 18,840
I090 WB OFF RAMP
FairOver: MORRIS CK
0.2 SE TILFORD INTERCH, Meade, SD
Built 1963 Load: 99.9 t ADT: 134
483RD AVE, HWY 111
FairOver: TRIB TO BIG SIOUX RV
1E & 5S BRANDON, Minnehaha, SD
Built 1952 Load: 99.9 t ADT: 542
SD079
FairOver: BILLOVER CK
0.8 N CUSTER CO LINE, Pennington, SD
Built 1997 Load: 99.9 t ADT: 6,956
SD044
FairOver: CK
10 SE OF SCENIC, Pennington, SD
Built 1983 Load: 99.9 t ADT: 486
IRR SD010
FairOver: CK
1.2 W OF SISSETON, Roberts, SD
Built 1997 Load: 99.9 t ADT: 2,520
Showing 3,001-3,050 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 |