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
I090 W
UnknownOver: 279 AVE (FAS 6500)
DRAPER INTERCHANGE, Jones, SD
Built 1970 ADT: 243
I090 E
UnknownOver: 279 AVE (FAS 6500)
DRAPER INTERCHANGE, Jones, SD
Built 1970 ADT: 243
I090 W
UnknownOver: 282 AVE
3 E DRAPER INTERCH, Jones, SD
Built 1970 ADT: 45
I090 E
UnknownOver: 282 AVE
3 E DRAPER INTERCH, Jones, SD
Built 1970 ADT: 45
I090 W
UnknownOver: 286 AVE (FAS 6259)
4.7 W US 83 N INTERCHANGE, Jones, SD
Built 1970 ADT: 57
I090 E
UnknownOver: 286 AVE (FAS 6259)
4.7 W US 83 N INTERCHANGE, Jones, SD
Built 1970 ADT: 57
I090 W
UnknownOver: SCHENK LANE
2 E WYO. LN, INTERCHANGE, Lawrence, SD
Built 1974 ADT: 220
I090 E
UnknownOver: SCHENK LANE
2 E WYO. LN, INTERCHANGE, Lawrence, SD
Built 1974 ADT: 220
I090 W
UnknownOver: FAS COUNTY RD
3 W US 85 INTERCH, Lawrence, SD
Built 1974 ADT: 2,015
I090 E
UnknownOver: FAS COUNTY RD
3 W US 85 INTERCH, Lawrence, SD
Built 1974 ADT: 2,015
I090 W
UnknownOver: OLD BELLE RD
1.3 W US 85 INTERCHANGE, Lawrence, SD
Built 1974 ADT: 2,607
I090 E
UnknownOver: OLD BELLE RD
1.3 W US 85 INTERCHANGE, Lawrence, SD
Built 1974 ADT: 2,607
US085
UnknownOver: I090
US 85 INTERCHANGE, Lawrence, SD
Built 1971 ADT: 9,360
JACKSON BLVD
UnknownOver: I090
SPEARFISH INTERCHANGE, Lawrence, SD
Built 1971 ADT: 9,360
I090 W
UnknownOver: SANDSTONE DR
0.7 W US 14A INTERCH, Lawrence, SD
Built 1970 ADT: 2,330
I090 E
UnknownOver: SANDSTONE DR
0.7 W US 14A INTERCH, Lawrence, SD
Built 1970 ADT: 2,330
US014A
UnknownOver: I090
US 14A INTERCHANGE, Lawrence, SD
Built 2016 ADT: 14,610
I090 W
UnknownOver: N RAINBOW RD
1.5 W US 85 S INTERCH, Lawrence, SD
Built 1971 ADT: 360
I090 E
UnknownOver: N RAINBOW RD
1.5 W US 85 S INTERCH, Lawrence, SD
Built 1971 ADT: 360
US085 S
UnknownOver: I090
US 85 S INTERCHANGE, Lawrence, SD
Built 1971 ADT: 14,610
US085 N
UnknownOver: I090
US 85 S INTERCHANGE, Lawrence, SD
Built 1971 ADT: 10,260
I090 W
UnknownOver: ST ONGE OIL RD (FAS)
0.7 E US 85 S INTERCH, Lawrence, SD
Built 1971 ADT: 425
I090 E
UnknownOver: ST ONGE OIL RD (FAS)
0.7 E US 85 S INTERCH, Lawrence, SD
Built 1971 ADT: 425
COUNTY RD
UnknownOver: I090
2.2 W SD 34 N INTERCH, Lawrence, SD
Built 1968 ADT: 10,260
SD034
UnknownOver: I090
SD 34 W INTERCHANGE, Lawrence, SD
Built 1968 ADT: 10,260
WHITEWOOD SERVICE
UnknownOver: COUNTY RD, RC,P&E RR
E BOUNDARY WHITEWOOD, Lawrence, SD
Built 1937 ADT: 50
EDEN RD
UnknownOver: I090
2.4 SE SD 34 N INTERCH, Lawrence, SD
Built 1968 ADT: 10,290
I029 S
UnknownOver: 271 ST - COUNTY RD 106
2.1 S I229 INTERCHANGE, Lincoln, SD
Built 2005 ADT: 7,435
I029 N
UnknownOver: 271 ST - COUNTY RD 106
2.1 S I229 INTERCHANGE, Lincoln, SD
Built 2005 ADT: 7,435
273 ST (FAS 6378)
UnknownOver: I029
HARRISBURG INTERCHANGE, Lincoln, SD
Built 1958 ADT: 22,460
276 ST (FAS 6380)
UnknownOver: I029
4.0 N SD 44 INTERCHANGE, Lincoln, SD
Built 1993 ADT: 18,060
278 ST
UnknownOver: I029
2 N SD 44 INTERCH, Lincoln, SD
Built 1958 ADT: 18,060
SD044
UnknownOver: I029
SD 44 INTERCHANGE, Lincoln, SD
Built 1958 ADT: 18,060
281 ST
UnknownOver: I029
1 N US 18 E INTERCH, Lincoln, SD
Built 1958 ADT: 17,890
US018
UnknownOver: I029
US 18 E INTERCHANGE, Lincoln, SD
Built 2015 ADT: 17,890
US018
UnknownOver: I029
US 18 W INTERCHANGE, Lincoln, SD
Built 1960 ADT: 17,450
288 ST (FAS 6382)
UnknownOver: I029
3 S US 18 W INTERCHANGE, Lincoln, SD
Built 1960 ADT: 14,270
291 ST (FAS 6102)
UnknownOver: I029
6 N SD 46 INTERCHANGE, Lincoln, SD
Built 1961 ADT: 14,070
294 ST (FAS 6116)
UnknownOver: I029
3 N SD 46 INTERCHANGE, Lincoln, SD
Built 1961 ADT: 13,790
I029 S
UnknownOver: I229 S & I029 S OFF RAMP
I 29 & I 229 INTERCHANGE, Lincoln, SD
Built 2016 ADT: 20,030
I029 N
UnknownOver: I229 S & I029 S OFF RAMP
I 29 & I 229 INTERCHANGE, Lincoln, SD
Built 2016 ADT: 20,030
SOLBERG AVE
UnknownOver: I229
0.25 E OF I29 INTERCHANGE, Lincoln, SD
Built 2013 ADT: 27,480
S LOUISE AVE
UnknownOver: I229
LOUISE AVE INTERCHANGE, Lincoln, SD
Built 1993 ADT: 34,780
US083
UnknownOver: I090
US 83 N INTERCHANGE, Lyman, SD
Built 1970 ADT: 6,830
I090 W
UnknownOver: 293 AVE
1.3 E US 83 N INTERCHANGE, Lyman, SD
Built 1970 ADT: 50
I090 E
UnknownOver: 293 AVE
1.3 E US 83 N INTERCHANGE, Lyman, SD
Built 1970 ADT: 50
I090 W
UnknownOver: SUNDANCE RD
3.6 E US 83 N INTERCH, Lyman, SD
Built 1970 ADT: 5
I090 E
UnknownOver: SUNDANCE RD
3.6 E US 83 N INTERCH, Lyman, SD
Built 1970 ADT: 5
I090 W
UnknownOver: 300 AVE
7.5 E US 83 N INTERCHANGE, Lyman, SD
Built 1970 ADT: 132
I090 E
UnknownOver: 300 AVE
7.5 E US 83 N INTERCHANGE, Lyman, SD
Built 1970 ADT: 132
Showing 151-200 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 |