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
SD028
FairOver: LAKE POINSETT OUTLET
5.0 E JCT US 81, Hamlin, SD
Built 1951 Load: 31.2 t ADT: 998
I029 S
FairOver: SADDLE CK
2.6 S US 18 W INTERCH, Lincoln, SD
Built 1961 Load: 31.2 t ADT: 9,885
I029 N
FairOver: SADDLE CK
2.6 S US 18 W INTERCH, Lincoln, SD
Built 1961 Load: 31.2 t ADT: 9,885
IRR US212
FairOver: MISSOURI RV (OAHE LK)
DEWEY - POTTER CO. LINE, Potter, SD
Built 1958 Load: 31.2 t ADT: 582
SD037
FairOver: BR FORDHAM CK
6.4 N JCT US 212, Spink, SD
Built 1957 Load: 31.2 t ADT: 446
IRR US012
FairOver: MISSOURI RV (OAHE LK)
CORSON - WALWORTH CO LN, Walworth, SD
Built 1959 Load: 31.2 t ADT: 2,092
SD047
FairOver: PONCA CK
5.3 S JCT US 18 BURKE, Gregory, SD
Built 1961 Load: 31.3 t ADT: 448
SD028
FairOver: DOLPH CK
3.7 W JCT SD 21 N, Hamlin, SD
Built 1949 Load: 31.3 t ADT: 1,364
464TH AVE, HWY 149
FairOver: WEST BR SKUNK CK
2.5N & 1E HARTFORD, Minnehaha, SD
Built 1967 Load: 31.3 t ADT: 1,554
IRR US018
FairOver: WHITE CLAY CK
12.7 E FALL RIVER CO, Oglala Lakota, SD
Built 1953 Load: 31.3 t ADT: 1,463
SD037 S
FairOver: STONY RUN CK
3.5 S JCT US 14, Beadle, SD
Built 1972 Load: 31.4 t ADT: 2,471
SD037 S
FairOver: CAIN CK
4.4 N SANBORN CO LINE, Beadle, SD
Built 1972 Load: 31.4 t ADT: 1,670
SD037 N
FairOver: STONY RUN CK
3.5 S JCT US 14, Beadle, SD
Built 1970 Load: 31.4 t ADT: 2,471
SD037 N
FairOver: CAIN CK
4.4 N SANBORN CO LINE, Beadle, SD
Built 1970 Load: 31.4 t ADT: 1,670
IRR US012
FairOver: HAY CK
6.7 E PERKINS CO LINE, Corson, SD
Built 1962 Load: 31.4 t ADT: 436
SD079
FairOver: BIG NASTY CK
13.7 N JCT SD 20, Harding, SD
Built 1962 Load: 31.4 t ADT: 357
284th Street
FairOver: Long Creek
5S & 0.2W of Lennox, Lincoln, SD
Built 1991 Load: 31.4 t ADT: 55
BRUSHIE CREEK RD.
FairOver: BRUSHY CK
12 S & 5.2 W FAITH, Meade, SD
Built 2013 Load: 31.4 t ADT: 37
IRR US018
FairOver: BLACK TAIL CK
1.8 E FALL RIVER CO LINE, Oglala Lakota, SD
Built 1953 Load: 31.4 t ADT: 676
SD015
FairOver: NORTH FORK WHETSTONE RV
1.4 E JCT SD 123, Roberts, SD
Built 1958 Load: 31.4 t ADT: 760
219TH STREET
FairOver: CK
1.3E & 7S BROOKINGS, Brookings, SD
Built 1966 Load: 31.5 t ADT: 92
US014
FairOver: CK
1.1 NE JACKSON CO LINE, Haakon, SD
Built 1955 Load: 31.5 t ADT: 1,015
FAS 6521
FairOver: WHITE WILLOW CK
9 E 0.6 S PHILIP, Haakon, SD
Built 1960 Load: 31.5 t ADT: 35
42020 KEIPER RD.
FairOver: JAMES RV
0.4 NE MILLTOWN, Hutchinson, SD
Built 1964 Load: 31.5 t ADT: 260
I090 E
FairOver: SPEARFISH CK
0.3 W US 85 INTERCH, Lawrence, SD
Built 1971 Load: 31.5 t ADT: 5,365
GALAXY RD.
FairOver: ELK CK
15E&11.3S STURGIS, Meade, SD
Built 1925 Load: 31.5 t ADT: 15
244TH STREET
FairOver: BIG SIOUX RIVER
3.4E & 1.7N DELL RAPIDS, Minnehaha, SD
Built 1969 Load: 31.5 t ADT: 13
SD244
FairOver: PALMER GULCH
3.2 E JCT US 385 & 16, Pennington, SD
Built 1966 Load: 31.5 t ADT: 4,870
SD044
FairOver: CHEYENNE RV
14.2 SE OF FARMINGDALE, Pennington, SD
Built 1962 Load: 31.5 t ADT: 1,182
US212
FairOver: BELLE FOURCHE RV
0.3 E JCT US 85 @ B. F., Butte, SD
Built 1992 Load: 31.6 t ADT: 2,793
46230 306 ST.
FairOver: VERMILLION RV OVERFLOW
2.8W HUB CITY, Clay, SD
Built 1970 Load: 31.6 t ADT: 150
432 AVE
FairOver: CK
1E & 1.5N Menno, Hutchinson, SD
Built 1980 Load: 31.6 t ADT: 15
I029 S
FairOver: CK
0.4 S SD 48 INTERCH, Union, SD
Built 1961 Load: 31.6 t ADT: 7,670
I029 N
FairOver: CK
0.4 S SD 48 INTERCH, Union, SD
Built 1961 Load: 31.6 t ADT: 7,670
SD377
FairOver: JOHNSON CK
1.3 SW JCT SD 240, Jackson, SD
Built 1959 Load: 31.7 t ADT: 538
I090 E
FairOver: CK
5.5 W US 83 N INTERCH, Jones, SD
Built 1970 Load: 31.7 t ADT: 3,700
SD010
FairOver: DRAINAGE DITCH
4.6 W JCT SD 27 S, Marshall, SD
Built 1948 Load: 31.7 t ADT: 760
26910 453 AVE
FairOver: EAST FORK VERMILLION RV
6N PARKER, Turner, SD
Built 1970 Load: 31.7 t ADT: 97
I029 S
FairOver: BR NORTH DEER CK
4.4 S DEUEL CO LINE, Brookings, SD
Built 1970 Load: 31.8 t ADT: 4,680
I029 N
FairOver: BR NORTH DEER CK
4.4 S DEUEL CO LINE, Brookings, SD
Built 1970 Load: 31.8 t ADT: 4,680
SD045
FairOver: SOUTH FORK SNAKE CK
1 N JCT US 212, Faulk, SD
Built 1975 Load: 31.8 t ADT: 939
FAS 6159/Otumwa Rd
FairOver: MITCHELL CK
2.5 S OF OTTUMWA, Haakon, SD
Built 1960 Load: 31.8 t ADT: 26
I029 S
FairOver: STRAY HORSE CK
4 NW OF SD 22 INTERCH, Hamlin, SD
Built 1973 Load: 31.8 t ADT: 4,305
I029 N
FairOver: STRAY HORSE CK
4 NW OF SD 22 INTERCH, Hamlin, SD
Built 1973 Load: 31.8 t ADT: 4,305
FAS 6420
FairOver: CROOKED CK
5 N 6.2 W LUDLOW, Harding, SD
Built 2016 Load: 31.8 t ADT: 139
I029 S
FairOver: BEAVER CK
2.7 N SD 44 INTERCH, Lincoln, SD
Built 1958 Load: 31.8 t ADT: 12,340
I029 N
FairOver: BEAVER CK
2.7 N SD 44 INTERCH, Lincoln, SD
Built 1958 Load: 31.8 t ADT: 12,340
SD047
FairOver: BULL CK
5.3 S JCT SD 49, Lyman, SD
Built 1954 Load: 31.8 t ADT: 248
254th Street
FairOver: E. Fork of Vermillion Rv
Clark Street in Montrose, McCook, SD
Built 1963 Load: 31.8 t ADT: 555
258TH ST, HWY 130
FairOver: SLIP-UP CREEK
2.7E RENNER, Minnehaha, SD
Built 1964 Load: 31.8 t ADT: 2,043
Showing 2,101-2,150 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 |