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
US016AW
UnknownOver: US016 E
KEYSTONE INTERCHANGE, Pennington, SD
Built 1968 ADT: 3,678
US016AE
UnknownOver: US016AW
KEYSTONE INTERCHANGE, Pennington, SD
Built 1968 ADT: 2,023
US016A
UnknownOver: US016A,
0.9 S JCT SD 244, Pennington, SD
Built 1985 ADT: 582
US016A
UnknownOver: US016A,
2.7 S JCT SD 244, Pennington, SD
Built 1992 ADT: 338
US016A
UnknownOver: US016A,
1.8 S JCT SD 244, Pennington, SD
Built 1976 ADT: 582
SD445
UnknownOver: I090
DEADWOOD AVE INTERCHANGE, Pennington, SD
Built 1983 ADT: 24,000
I190
UnknownOver: NORTH ST
North St & I190 INTRCHGE, Pennington, SD
Built 2016 ADT: 100
I190
UnknownOver: I090
I 90 & I 190 INTERCHANGE, Pennington, SD
Built 2000 ADT: 37,060
ANAMOSA ST
UnknownOver: I190
0.5 S I 90 INTERCH, Pennington, SD
Built 1959 ADT: 18,866
TOWER DRIVE
UnknownOver: US016
1.9 S JCT SD 44 E, Pennington, SD
Built 1964 ADT: 12,812
I090 W
UnknownOver: HAINES AVE
HAINES AVE INTERCHANGE, Pennington, SD
Built 2001 ADT: 22,021
I090 E
UnknownOver: HAINES AVE
HAINES AVE INTERCHANGE, Pennington, SD
Built 2000 ADT: 22,021
RCP & E RR
UnknownOver: EAST BLVD
EAST BLVD., Pennington, SD
Built 1937 ADT: 3,774
I090 W
UnknownOver: MAPLE AVE
0.5 E HAINES AVE INTERCH, Pennington, SD
Built 1959 ADT: 5,625
I090 E
UnknownOver: MAPLE AVE
0.5 E HAINES AVE INTERCH, Pennington, SD
Built 1959 ADT: 5,625
LACROSSE ST
UnknownOver: I090
LACROSSE ST INTERCHANGE, Pennington, SD
Built 1983 ADT: 33,010
LACROSSE ST
UnknownOver: I090
LACROSSE ST INTERCHANGE, Pennington, SD
Built 2022 ADT: 33,010
SD079NF
UnknownOver: ST JOSEPH ST, RCP&E RR
1.2 S JCT SD 44, Pennington, SD
Built 1964 ADT: 15,500
US016 B (SE CONN)
UnknownOver: SD079
US16B & SD79 INTERCHANGE, Pennington, SD
Built 2004 ADT: 14,172
I090 W
UnknownOver: E NORTH ST
E NORTH & I 90 INTERCHANG, Pennington, SD
Built 2005 ADT: 11,054
I090 E
UnknownOver: E NORTH ST
E NORTH & I090 INTERCHANG, Pennington, SD
Built 2005 ADT: 11,054
US016 B (SE CONN)
UnknownOver: SD044, SD RR (ABAND)
JCT US16B & SD44, Pennington, SD
Built 2002 ADT: 23,552
US016 B (SE CONN)
UnknownOver: I090
US16 B INTERCHANGE, Pennington, SD
Built 2007 ADT: 27,450
I090 WB ON RAMP
UnknownOver: I090
2.0 E US 16 B INTERCHANGE, Pennington, SD
Built 1963 ADT: 26,980
I090 WF
UnknownOver: I090
2.3 E US 16 B INTERCHANGE, Pennington, SD
Built 2006 ADT: 16,090
I090 W
UnknownOver: SOUTH GATE RD, CK
1.5 W EXIT 67, Pennington, SD
Built 1963 ADT: 1,470
I090 E
UnknownOver: SOUTH GATE RD, CK
1.5 W EXIT 67, Pennington, SD
Built 1963 ADT: 1,470
I090 W
UnknownOver: S ELLSWORTH RD
1.0 W EXIT 67, Pennington, SD
Built 1963 ADT: 9,221
I090 E
UnknownOver: S ELLSWORTH RD
1.0 W EXIT 67, Pennington, SD
Built 1963 ADT: 9,221
LIBERTY BLVD.
UnknownOver: I090
EXIT 67, Pennington, SD
Built 2002 ADT: 16,090
I090 W
UnknownOver: 151 AVE (FAS), DRAW
1.0 E. OF EXIT 67, Pennington, SD
Built 1961 ADT: 395
I090 E
UnknownOver: 151 AVE (FAS), DRAW
1.9 E BOX ELDER INTERCH, Pennington, SD
Built 1961 ADT: 395
154 AVE
UnknownOver: I090
4.0 E BOX ELDER INTERCH, Pennington, SD
Built 1961 ADT: 10,560
I090 W
UnknownOver: 158 AVE
3.0 W NEW UNDRWD INTERCH, Pennington, SD
Built 1961 ADT: 70
I090 E
UnknownOver: 158 AVE
3.0 W NEW UNDRWD INTERCH, Pennington, SD
Built 1961 ADT: 70
161 AVE (FAS 6121)
UnknownOver: I090
NEW UNDERWOOD INTERCHANGE, Pennington, SD
Built 1961 ADT: 10,560
164 AVE
UnknownOver: I090
3.0 E NEW UNDRWD INTERCH, Pennington, SD
Built 1961 ADT: 7,520
DUNCAN RD
UnknownOver: I090
6.0 E NEW UND INTERCHANGE, Pennington, SD
Built 1961 ADT: 7,520
I090 W
UnknownOver: 169 AVE, DRAW
8.0 E NEW UNDRWD INTERCH, Pennington, SD
Built 1961 ADT: 20
I090 E
UnknownOver: 169 AVE, DRAW
8.0 E NEW UNDRWD INTERCH, Pennington, SD
Built 1960 ADT: 20
171 AVE
UnknownOver: I090
10 E NEW UND INTERCHANGE, Pennington, SD
Built 1961 ADT: 7,440
I090 W
UnknownOver: 173 AVE (FAS 6110)
8 W WASTA INTERCHANGE, Pennington, SD
Built 1961 ADT: 98
I090 E
UnknownOver: 173 AVE (FAS 6110)
8 W WASTA INTERCHANGE, Pennington, SD
Built 1960 ADT: 98
I090 W
UnknownOver: 175 AVE
6 W WASTA INTERCH, Pennington, SD
Built 1960 ADT: 10
I090 E
UnknownOver: 175 AVE
6 W WASTA INTERCH, Pennington, SD
Built 1960 ADT: 10
I090 W
UnknownOver: BASE LINE RD, RCP&E RR
WASTA INTERCHANGE, Pennington, SD
Built 2002 ADT: 472
I090 E
UnknownOver: BASE LINE RD, RCP&E RR
WASTA INTERCHANGE, Pennington, SD
Built 2002 ADT: 472
CROOKED CREEK RD
UnknownOver: I090
3.1 E WASTA INTERCHANGE, Pennington, SD
Built 1964 ADT: 7,420
CEDAR BUTTE RD
UnknownOver: I090
1.9 NW W WALL INTERCHANGE, Pennington, SD
Built 1968 ADT: 7,370
SD240
UnknownOver: I090
WEST WALL INTERCHANGE, Pennington, SD
Built 1968 ADT: 7,350
Showing 351-400 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 |