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
193rd Street
FairOver: Pearl Creek
15N & 4.2W of Iroquois, Beadle, SD
Built 1928 Load: 24.5 t ADT: 56
196th Street
FairOver: Creek
7.5N & 3.8E of Yale, Beadle, SD
Built 1940 Load: 24.5 t ADT: 90
202nd Street
FairOver: Middle Pearl Creek
6N & 2.5W of Iroquois, Beadle, SD
Built 1969 Load: 24.5 t ADT: 302
231 AVENUE
FairOver: CK
2.3 N TUTHILL, Bennett, SD
Built 1954 Load: 24.5 t ADT: 123
40940 306th Street
FairOver: Trib. to Emanuel Creek
6.6W & 2S of Tyndall, Bon Homme, SD
Built 1930 Load: 24.5 t ADT: 60
41109 292nd Street
FairOver: Emanuel Creek
11.1W of Scotland, Bon Homme, SD
Built 1936 Load: 24.5 t ADT: 127
30080 413th Avenue
FairOver: Trib. to Emanuel Creek
3W & 2.2N of Tyndall, Bon Homme, SD
Built 1970 Load: 24.5 t ADT: 60
41680 306th Street
FairOver: Silver Creek
2S & 0.2W of Tyndall, Bon Homme, SD
Built 1930 Load: 24.5 t ADT: 60
29570 418th Avenue
FairOver: Beaver Creek
8.3N & 1.5E of Tyndall, Bon Homme, SD
Built 1925 Load: 24.5 t ADT: 60
30640 418th Avenue
FairOver: Deadman Creek
1.5E & 2.4S of Tyndall, Bon Homme, SD
Built 1941 Load: 24.5 t ADT: 25
30670 418th Avenue
FairOver: Deadman Creek
1.5E & 2.7S of Tyndall, Bon Homme, SD
Built 1941 Load: 24.5 t ADT: 25
31020 424th Avenue
FairOver: Charley Creek
3W & 4.2S of Tabor, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 60
42510 303rd Street
FairOver: Beaver Creek
3N & 1.9W of Tabor, Bon Homme, SD
Built 1965 Load: 24.5 t ADT: 60
42530 304th Street
FairOver: Beaver Creek
8.3E of Tyndall, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 60
42610 310th Street
FairOver: Creek
3S & 0.9W of Tabor, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 60
42530 304th Street
FairOver: Beaver Creek
2N & 0.5W of Tabor, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 60
42720 304th Street
FairOver: Beaver Creek
2N & 0.2E Tabor, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 150
42780 305th Street
FairOver: Beaver Creek
1N & 0.8E Tabor, Bon Homme, SD
Built 1935 Load: 24.5 t ADT: 60
141st Street
FairOver: Snake Creek
10.9W & 1N of Warner, Brown, SD
Built 1986 Load: 24.5 t ADT: 27
114th Street
FairOver: Willow Creek
9.2W of Barnard, Brown, SD
Built 1940 Load: 24.5 t ADT: 98
114th Street
FairOver: Willow Creek
8.5W Barnard, Brown, SD
Built 1940 Load: 24.5 t ADT: 18
109th Street
FairOver: Elm River
1.7S & 6.7W of Frederick, Brown, SD
Built 1925 Load: 24.5 t ADT: 27
126th Street
FairOver: Richmond Lake
4.5N & 0.8E of Richmond, Brown, SD
Built 2001 Load: 24.5 t ADT: 199
114th Street
FairOver: Elm River
3.7W of Barnard, Brown, SD
Built 1981 Load: 24.5 t ADT: 98
384th Avenue
FairOver: Mud Creek
0.3N of Mansfield, Brown, SD
Built 2002 Load: 24.5 t ADT: 98
113th Street
FairOver: Elm River
3W & 1N of Barnard, Brown, SD
Built 2012 Load: 24.5 t ADT: 70
384th Avenue
FairOver: Elm River
2.8S & 3W of Barnard, Brown, SD
Built 1970 Load: 24.5 t ADT: 98
107th Street
FairOver: Dry Branch Creek
0.3N & 2.2W of Frederick, Brown, SD
Built 2013 Load: 24.5 t ADT: 249
130th Street
FairOver: Foot Creek
3N & 2.3W of Aberdeen, Brown, SD
Built 1976 Load: 24.5 t ADT: 98
132nd Street
FairOver: Foot Creek
1.0N & 1.9W of Aberdeen, Brown, SD
Built 2003 Load: 24.5 t ADT: 70
134th Street
FairOver: Foot Creek
1S & 1.3W of Aberdeen, Brown, SD
Built 1965 Load: 24.5 t ADT: 98
Main Street
FairOver: Maple River
West edge of Frederick, Brown, SD
Built 1981 Load: 24.5 t ADT: 267
139th Street
FairOver: Moccasin Creek
3N & 0.4W of Warner, Brown, SD
Built 1983 Load: 24.5 t ADT: 98
387th Avenue
FairOver: Moccasin Creek
3.5N of Warner, Brown, SD
Built 2009 Load: 24.5 t ADT: 775
120th Street
FairOver: Elm River
0.4E of Westport, Brown, SD
Built 1974 Load: 24.5 t ADT: 98
135th Street
FairOver: Moccasin Creek
2S & 0.8E of Aberdeen, Brown, SD
Built 1977 Load: 24.5 t ADT: 900
388th Avenue
FairOver: Moccasin Creek
1E & 1.5S of Warner, Brown, SD
Built 2007 Load: 24.5 t ADT: 98
103rd Street
FairOver: Maple River
4.3N & 2.1E of Frederick, Brown, SD
Built 2007 Load: 24.5 t ADT: 98
141st Street
FairOver: Moccasin Creek
3.5E & 1N of Warner, Brown, SD
Built 1983 Load: 24.5 t ADT: 98
140th Street
FairOver: Moccasin Creek
4.7E & 2N of Warner, Brown, SD
Built 1983 Load: 24.5 t ADT: 15
146th Street
FairOver: James River
3S & 2.8W of Stratford, Brown, SD
Built 1970 Load: 24.5 t ADT: 98
144th Street
FairOver: James River
1S & 2.7W of Stratford, Brown, SD
Built 1989 Load: 24.5 t ADT: 98
395th Avenue
FairOver: Moccasin Creek
1W & 4.1N of Stratford, Brown, SD
Built 2008 Load: 24.5 t ADT: 214
104th Street
FairOver: James River
3N & 0.1E of Stratford, Brown, SD
Built 1940 Load: 24.5 t ADT: 98
400th Avenue
FairOver: James River
1E & 1.4S of Tacoma Park, Brown, SD
Built 1978 Load: 24.5 t ADT: 54
400th Avenue
FairOver: James River
0.7W & 4N of James, Brown, SD
Built 2014 Load: 24.5 t ADT: 54
127th Street
FairOver: Crow Creek Ditch
1.1E of Tacoma Park, Brown, SD
Built 2014 Load: 24.5 t ADT: 283
114th Street
FairOver: Crow Creek Ditch
4N & 2.5W of Claremont, Brown, SD
Built 2012 Load: 24.5 t ADT: 98
408th Avenue
FairOver: Crow Creek Ditch
4.3E & 1.6S of Hecla, Brown, SD
Built 1935 Load: 24.5 t ADT: 97
134th Street
FairOver: Creek
3.9E & 1.6S of Groton, Brown, SD
Built 1930 Load: 24.5 t ADT: 98
Showing 1,201-1,250 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 |