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
IRR US018
FairOver: WHITE RV
10 E FALL RIVER CO LINE, Oglala Lakota, SD
Built 1953 Load: 32.6 t ADT: 1,463
SD037
FairOver: FORDHAM CK
7.7 N JCT US 212, Spink, SD
Built 1958 Load: 32.6 t ADT: 446
IRR BIA RTE 6
FairOver: RATTLESNAKE CREEK
13.0 KM SE RED SCAFFOLD, Ziebach, SD
Built 1986 Load: 32.6 t ADT: 293
US281
FairOver: WEST BR FIRESTEEL CK
8.5 N I 90 INTERCH, Aurora, SD
Built 1959 Load: 32.7 t ADT: 1,296
155 STREET
FairOver: BIG SIOUX RV
6.7E & 6N FLORENCE, Codington, SD
Built 1996 Load: 32.7 t ADT: 16
453 AVENUE
FairOver: SOO CK
8.5E 4.2N FLORENCE, Codington, SD
Built 1980 Load: 32.7 t ADT: 73
43RD ST., WTN.
FairOver: WILLOW CK
3.0E 1.9N WATERTOWN, Codington, SD
Built 1996 Load: 32.7 t ADT: 73
459 AVE
FairOver: WILLOW CK
4.0E 1.4N WATERTOWN, Codington, SD
Built 2006 Load: 32.7 t ADT: 100
OAK STREET
FairOver: WILLOW CK
5.9E 3.6N WATERTOWN, Codington, SD
Built 1988 Load: 32.7 t ADT: 40
177 ST
FairOver: STRAY HORSE CK
5.0S KRANZBURG, Codington, SD
Built 2006 Load: 32.7 t ADT: 20
HASSELSTROM PLACE
FairOver: BATTLE CK
1S HERMOSA, Custer, SD
Built 1982 Load: 32.7 t ADT: 15
TWNSHP RD 477TH AV
FairOver: CK
3.2N,1E TUNERVILLE, Deuel, SD
Built 1982 Load: 32.7 t ADT: 35
TWNSHP RD 168TH ST
FairOver: CK
1.2E & 4N TUNERVILLE, Deuel, SD
Built 1988 Load: 32.7 t ADT: 35
160TH ST
FairOver: SOUTH FORK SNAKE CK
8.5E & 2.5N FAULKTON, Faulk, SD
Built 2003 Load: 32.7 t ADT: 15
154 STREET
FairOver: BIG SIOUX RV
3N & 12.7W S SHORE, Grant, SD
Built 1992 Load: 32.7 t ADT: 52
452 AVENUE
FairOver: BIG SIOUX RV
12.5W & 1.5N MARVIN, Grant, SD
Built 1996 Load: 32.7 t ADT: 25
452 AVE
FairOver: BIG SIOUX RV
12.5W & 4.0S MARVIN, Grant, SD
Built 2004 Load: 32.7 t ADT: 25
452 AVE
FairOver: INDIAN RV
6.0S & 12.5W MARVIN, Grant, SD
Built 2004 Load: 32.7 t ADT: 12
145 ST
FairOver: CK
12.6W & 1.5N MARVIN, Grant, SD
Built 2008 Load: 32.7 t ADT: 35
150 STREET
FairOver: BIG SIOUX RV
12.5W & 3.5S MARVIN, Grant, SD
Built 2010 Load: 32.7 t ADT: 52
468 AVENUE
FairOver: CK
3.3E & 2.9N MARVIN, Grant, SD
Built 2009 Load: 32.7 t ADT: 25
143 STREET
FairOver: CK
3.5N & 4.5E MARVIN, Grant, SD
Built 1998 Load: 32.7 t ADT: 52
473 AVENUE
FairOver: CK
5W & 2.1S MILBANK, Grant, SD
Built 2007 Load: 32.7 t ADT: 20
474 AVENUE
FairOver: CK
4W & 6.5N MILBANK, Grant, SD
Built 2002 Load: 32.7 t ADT: 52
475TH AVENUE
FairOver: CK
3W & 3.1N MILBANK, Grant, SD
Built 2000 Load: 32.7 t ADT: 20
155 STREET
FairOver: CK
2.7 W & 6.0 S of Milbank, Grant, SD
Built 2002 Load: 32.7 t ADT: 52
153 STREET
FairOver: CK
2.1W & 3S MILBANK, Grant, SD
Built 2012 Load: 32.7 t ADT: 52
477 AVENUE
FairOver: CK
1W & 3.6N MILBANK, Grant, SD
Built 2014 Load: 32.7 t ADT: 20
477 AVENUE
FairOver: SOUTH FORK WHETSTONE RV
1W & 0.2N MILBANK, Grant, SD
Built 1989 Load: 32.7 t ADT: 30
477 AVENUE
FairOver: CK
1W & 4.9S MILBANK, Grant, SD
Built 2013 Load: 32.7 t ADT: 70
477 AVE
FairOver: CK
5.0W & 0.9N ALBEE, Grant, SD
Built 2004 Load: 32.7 t ADT: 25
479 AVENUE
FairOver: SOUTH FORK WHETSTONE RV
1E & 0.6N MILBANK, Grant, SD
Built 2003 Load: 32.7 t ADT: 40
148 STREET
FairOver: CK
1.8E & 0.9N MILBANK, Grant, SD
Built 1992 Load: 32.7 t ADT: 35
147 ST
FairOver: SOUTH FORK WHETSTONE RV
3.0E & 1.5N MILBANK, Grant, SD
Built 2006 Load: 32.7 t ADT: 45
485 AVENUE
FairOver: BURLINGTON NORTHERN RR
1S & 1.5W BIG STONE, Grant, SD
Built 1978 Load: 32.7 t ADT: 397
153 STREET
FairOver: NORTH FORK YELLOW BANK R
7.8E & 4S MILBANK, Grant, SD
Built 1979 Load: 32.7 t ADT: 31
298 STREET
FairOver: WILLOW CK
9.1W BONESTEEL, Gregory, SD
Built 1930 Load: 32.7 t ADT: 36
FAS 6188
FairOver: NORTH FORK BAD RV
8 W 3.2 N PHILIP, Haakon, SD
Built 1960 Load: 32.7 t ADT: 86
US014
FairOver: GRINDSTONE CK
2.6 E OF PHILIP, Haakon, SD
Built 1955 Load: 32.7 t ADT: 725
Northwestern Ave
FairOver: BAD RV
0.9 E & 0.2 S MIDLND, Haakon, SD
Built 1970 Load: 32.7 t ADT: 60
SD042
FairOver: BLOOM CK
9.5 E DAVISON CO LINE, Hanson, SD
Built 1959 Load: 32.7 t ADT: 356
SD042
FairOver: BLOOM CK
10.4 E DAVISON CO LINE, Hanson, SD
Built 1959 Load: 32.7 t ADT: 356
448 AVE
FairOver: EAST FORK VERMILLION RV
3W & 1.8S ORLAND, Lake, SD
Built 1997 Load: 32.7 t ADT: 42
243 ST
FairOver: EAST FORK VERMILLION RV
2.9W & 2.0S ORLAND, Lake, SD
Built 1997 Load: 32.7 t ADT: 42
CITY STREET
FairOver: SILVER CK
UNION AVE S - MADISON, Lake, SD
Built 1978 Load: 32.7 t ADT: 100
500 N EGAN AVE
FairOver: MADISON CK
EGAN AVE N - MADISON, Lake, SD
Built 1993 Load: 32.7 t ADT: 3,190
610 S. EGAN AVENUE
FairOver: SILVER CK
EGAN AVE S - MADISON, Lake, SD
Built 1979 Load: 32.7 t ADT: 2,915
JACKSON BLVD
FairOver: SPEARFISH CK
JACKSON BLVD - SPEARFISH, Lawrence, SD
Built 1966 Load: 32.7 t ADT: 12,135
GRANT STREET
FairOver: SPEARFISH CK
GRANT ST - SPEARFISH, Lawrence, SD
Built 1988 Load: 32.7 t ADT: 3,981
8th Street
FairOver: Big Sioux River
E of Phillips Avenue - SF, Minnehaha, SD
Built 1912 Load: 32.7 t ADT: 7,100
Showing 2,201-2,250 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 |