How many bridges are in Wisconsin?

Wisconsin has 14,851 public highway bridges tracked in the FHWA National Bridge Inventory. View detailed condition data for each bridge on PlainBridges.

What percentage of bridges in Wisconsin are structurally deficient?

6.1% of bridges in Wisconsin are classified as structurally deficient by the FHWA, compared to a national average of 7.0%.

State profile · Near national median SD

Wisconsin bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Wisconsin — drawn straight from the FHWA National Bridge Inventory.

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 7, 2026

14,851
Public bridges: 41.3%
Good condition: 6.1%
Poor condition: 6.1%
Structurally deficient

Total Bridges

14,851

Public highway bridges in Wisconsin

Good Condition

41.3%

6,130 bridges rated 7-9

-8.7pp vs 50% benchmark

Poor Condition

6.1%

911 bridges rated 0-4

Structurally Deficient

6.1%

911 bridges flagged for repair priority

-0.9pp vs national avg 7.0%

Wisconsin vs national bridge condition

Wisconsin — Good condition share 41.3%

National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Wisconsin — Structurally deficient share 20.4%

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 — Wisconsin (FHWA NBI)

Counties (72)

Adams 43 Ashland 92 Barron 321 Bayfield 103 Brown 478 Buffalo 239 Burnett 68 Calumet 63 Chippewa 366 Clark 297 Columbia 191 Crawford 212 Dane 624 Dodge 219 Door 32 Douglas 143 Dunn 252 Eau Claire 242 Florence 20 Fond du Lac 256 Forest 54 Grant 385 Green 249 Green Lake 50 Iowa 212 Iron 52 Jackson 220 Jefferson 186 Juneau 174 Kenosha 121 Kewaunee 93 La Crosse 250 Lafayette 217 Langlade 78 Lincoln 158 Manitowoc 272 Marathon 534 Marinette 136 Marquette 85 Menominee 25 Milwaukee 1005 Monroe 385 Oconto 149 Oneida 64 Outagamie 300 Ozaukee 107 Pepin 57 Pierce 248 Polk 77 Portage 192 Price 104 Racine 143 Richland 298 Rock 325 Rusk 152 Sauk 277 Sawyer 98 Shawano 162 Sheboygan 249 St. Croix 308 Taylor 176 Trempealeau 260 Vernon 333 Vilas 29 Walworth 209 Washburn 54 Washington 166 Waukesha 380 Waupaca 172 Waushara 54 Winnebago 264 Wood 242

Wisconsin 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 Wisconsin on the same metric.

Mississippi

5.92% top marginal rate

Structure: Progressive
Burden @ $100K: $16,823

South Carolina

6.10% top marginal rate

Structure: Progressive
Burden @ $100K: $5,396

Selected

Wisconsin

6.13% top marginal rate

Structure: Progressive
Burden @ $100K: $14,851

North Carolina

6.16% top marginal rate

Structure: Progressive
Burden @ $100K: $18,901

Hawaii

6.47% top marginal rate

Structure: Progressive
Burden @ $100K: $1,206

Bridges Needing Most Attention in Wisconsin

Six lowest-condition bridges in Wisconsin, ranked by composite NBI rating. Each is inspected at least every 24 months.

LRD MARKET RD

Poor

Over: BEAR CREEK

1.2M N JCT STH 76, Outagamie, WI

Built 1958 Load: 1.6 t ADT: 1,175

LRD WOODFORD DR

Poor

Over: RAILS TO TRAILS TRAIL

0.3M E JCT USH 45, Washington, WI

Built 1910 Load: 1.6 t ADT: 47

LRD ACCESS RD

Poor

Over: MENASHA CHANNEL

ACCESS TO PARKING LOT BY, Winnebago, WI

Built 1960 Load: 1.6 t ADT: 20

CTH A

Structurally Deficient

Over: UNION PACIFIC RR

1.0M W JCT STH 73, Columbia, WI

Built 1910 Load: 3.2 t ADT: 197

LRD OLD 64 (DEAD E

Structurally Deficient

Over: EVERGREEN CREEK

0.1M N JCT STH 64, Langlade, WI

Built 1916 Load: 3.2 t ADT: 6

LRD CORNELL LANE (

Structurally Deficient

Over: BR COON CREEK

0.1M E JCT USH 14, Vernon, WI

Built 1985 Load: 3.2 t ADT: 10

All Bridges in Wisconsin

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Publisher	Kiznis Studio
Sources	FHWA National Bridge Inventory, public U.S. government datasets

Wisconsin vs national bridge condition

Condition Distribution

Counties (72)

Bridges Needing Most Attention in Wisconsin

LRD MARKET RD

LRD WOODFORD DR

LRD ACCESS RD

CTH A

LRD OLD 64 (DEAD E

LRD CORNELL LANE (

All Bridges in Wisconsin

CTH J NB

CTH J SB

USH 10 EB

USH 10 WB

USH10 EB

USH 10 WB

USH 10 EB

USH 10 WB

USH 10 EB

USH 10 WB

USH 10 EB

USH 10 WB

USH 10 EB

USH 10 WB

IH 10EB RAMP TO I-

IH USH10 EB RAMP T

IH I39 SB RAMP TO

IH USH10 EB RAMP T

IH39 NB RAMP TO US

STH 13/34 S OVER U

USH 10 WB

USH 10 EB

CTH O

USH 10 EB

USH 10WB

USH 10 EB

USH 10 WB

LRD PORTER ROAD

IH 39 NB/USH 51 NB

IH 39 SB/USH 51 SB

CANADIAN NATIONAL

TOMORROW RIVER STA

SOO LINE

SOO LINE

SOO LINE

SOO LINE

SOO LINE

SOO LINE

STH 13

CNW RR

STH 20-WASHINGTON

STH 20 WB

STH 20 EB

CMSTPP RR

LRD 6TH ST VIADUCT

STH 38-STATE ST

STH 142 - BUSHNELL

LRD BREVER RD

CTH A

LRD KETTERHAGEN RD

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