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
AVANCE RD.
FairOver: RED OWL CK
0.5W 0.1N MARCUS, Meade, SD
Built 1962 Load: 20.8 t ADT: 50
484TH AVE, HWY 109
FairOver: BEAVER CREEK
3W & 1.9S VALLEY SPRINGS, Minnehaha, SD
Built 1962 Load: 20.8 t ADT: 1,547
OLD WASTA RD
FairOver: CHEYENNE RV
1.0 N 2.4 E WASTA, Pennington, SD
Built 1940 Load: 20.8 t ADT: 120
28160 440TH AVE
FairOver: TURKEY RIDGE CK
7W & 7.6S MARION, Turner, SD
Built 1945 Load: 20.8 t ADT: 50
30310 483RD AVE
FairOver: CK
4E & 2.1S ALCESTER, Union, SD
Built 1983 Load: 20.8 t ADT: 45
184TH STREET
FairOver: DRY CK
.7N NEWELL .9E US79, Butte, SD
Built 1945 Load: 20.9 t ADT: 47
486 AVENUE
FairOver: CK
1W & 5.9N GARY, Deuel, SD
Built 1953 Load: 20.9 t ADT: 89
152 STREET
FairOver: BIG SIOUX RV
13.8W & 5.5S MARVIN, Grant, SD
Built 1948 Load: 20.9 t ADT: 52
158 ST
FairOver: CK
3.9W & 3.0N ALBEE, Grant, SD
Built 2006 Load: 20.9 t ADT: 35
480 AVE
FairOver: CK
1.8S & 1.5W REVILLO, Grant, SD
Built 2003 Load: 20.9 t ADT: 40
463 AVE
FairOver: BATTLE CK
1E & 0.2N RUTLAND, Lake, SD
Built 1956 Load: 20.9 t ADT: 238
60th Street North
FairOver: Big Sioux River
west of Minnesota Avenue, Minnehaha, SD
Built 1949 Load: 20.9 t ADT: 6,640
472nd Avenue
FairOver: N. Fork Whetstone Rv
2.2N of Corona, Roberts, SD
Built 1938 Load: 20.9 t ADT: 195
41190 301st Street
FairOver: Emanuel Creek
3.9E & 1N of Avon, Bon Homme, SD
Built 1984 Load: 21.0 t ADT: 60
ELM SPRINGS RD.
FairOver: ALKALI CK
2.0E8.7S ELM SPRINGS, Meade, SD
Built 1960 Load: 21.0 t ADT: 53
SD044
FairOver: LITTLE WHITE RV
0.7 W JCT US 83, Mellette, SD
Built 1973 Load: 21.0 t ADT: 802
241 ST
FairOver: BR FIRESTEEL CK
1.7W 2N STORLA, Aurora, SD
Built 2012 Load: 21.1 t ADT: 33
NEMO ROAD
FairOver: BOXELDER CK
10.1W 3.5N RAPID CITY, Pennington, SD
Built 1972 Load: 21.1 t ADT: 974
FDR 141
FairOver: RAPID CREEK
T 2 N R 5 E SEC 31, Pennington, SD
Built 1965 Load: 21.1 t ADT: 50
SD052
FairOver: CK
4.1 S JCT SD 5O, Yankton, SD
Built 1959 Load: 21.1 t ADT: 2,430
SD052
FairOver: CK
4.7 S JCT SD 50, Yankton, SD
Built 1959 Load: 21.1 t ADT: 2,430
I090
FairOver: MO. RV (FRANCIS CASE LK)
CHAMBERLAIN BRIDGE, Brule, SD
Built 1974 Load: 21.2 t ADT: 7,260
109TH Street
FairOver: Spring Creek
1.5 S & 8 W of Herreid, Campbell, SD
Built 1958 Load: 21.2 t ADT: 85
39390 291st Street
FairOver: Creek
6.0N & 1.1W of Wagner, Charles Mix, SD
Built 1935 Load: 21.2 t ADT: 48
410TH AVENUE
FairOver: FIRESTEEL CK
NE MITCHELL, Davison, SD
Built 1952 Load: 21.2 t ADT: 500
168TH ST
FairOver: CK
1S & 0.5E MIRANDA, Faulk, SD
Built 1938 Load: 21.2 t ADT: 55
466th Avenue
FairOver: Long Creek
1.3N of Jct US Hwy 18, Lincoln, SD
Built 1951 Load: 21.2 t ADT: 1,017
COUNTY HIGHWAY #9
FairOver: GRAY EAGLETAIL CK
11E & 4.5S NORRIS, Mellette, SD
Built 1960 Load: 21.2 t ADT: 53
COUNTY HIGHWAY #23
FairOver: WHITE HORSE CK
4S MOSHER, Mellette, SD
Built 1957 Load: 21.2 t ADT: 55
132nd Street
FairOver: Creek
2S & 3.8W of Selby, Walworth, SD
Built 1959 Load: 21.2 t ADT: 134
254 STREET
FairOver: CK
0.1E & 5S PUKWANA, Brule, SD
Built 1961 Load: 21.3 t ADT: 90
30230 435th Avenue
FairOver: Beaver Creek
1.7N of Utica, Yankton, SD
Built 1956 Load: 21.3 t ADT: 149
IRR BIA RTE 2
FairOver: STINK CREEK
3.2 KM WEST OF BULLHEAD, Corson, SD
Built 1960 Load: 21.4 t ADT: 101
395TH AVE
FairOver: James River
1W 0.8S FRANKFORT, Spink, SD
Built 1982 Load: 21.4 t ADT: 55
30430 474 AVE.
FairOver: EAST BRULE CK
2E & 6.3S BERESFORD, Union, SD
Built 1986 Load: 21.4 t ADT: 36
SD020
FairOver: GAP CK
2.1 W JCT SD 79 S, Harding, SD
Built 1959 Load: 21.5 t ADT: 158
272 STREET
FairOver: DOG EAR CK
6N & 3.4E WINNER, Tripp, SD
Built 1959 Load: 21.5 t ADT: 110
427 AVE
FairOver: ROCK CK
2.0E & 2.4S CARTHAGE, Miner, SD
Built 1930 Load: 21.6 t ADT: 20
SD020
FairOver: CK
1.8 W JCT SD 47 N, Potter, SD
Built 1952 Load: 21.6 t ADT: 184
48190 308 STR.
FairOver: CK
6.5S & 2.9E ALCESTER, Union, SD
Built 1940 Load: 21.6 t ADT: 100
IRR SD065
FairOver: MOREAU RV
12.8 S JCT SD 20, Ziebach, SD
Built 1972 Load: 21.6 t ADT: 588
333 AVENUE
FairOver: BULL CK
4.7N DALLAS, Gregory, SD
Built 1958 Load: 21.7 t ADT: 99
161 STREET
FairOver: GRAVEL CK
5.2W 4S SOUTH SHORE, Codington, SD
Built 1955 Load: 21.8 t ADT: 21
486 AVENUE
FairOver: LOST CK
1W 10.8N GARY, Deuel, SD
Built 1973 Load: 21.8 t ADT: 73
150 ST
FairOver: CK
3.2W & 1.0S MILBANK, Grant, SD
Built 2006 Load: 21.8 t ADT: 52
476 AVENUE
FairOver: CK
4E & 3.1S STRANDBURG, Grant, SD
Built 1930 Load: 21.8 t ADT: 27
486 AVENUE
FairOver: SOUTH FORK YELLOW BANK R
4.5E & 2.3N REVILLO, Grant, SD
Built 1973 Load: 21.8 t ADT: 207
363RD AVE
FairOver: REE CK
3.8N ST LAWRENCE, Hand, SD
Built 1992 Load: 21.8 t ADT: 147
26730 415 AVENUE
FairOver: TWELVE MILE CK
6W & 10.3S ALEXANDRI, Hanson, SD
Built 1954 Load: 21.8 t ADT: 65
SD248
FairOver: MEDICINE CK
2.1 W LYMAN CO LINE, Jones, SD
Built 1941 Load: 21.8 t ADT: 220
Showing 1,001-1,050 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 |