How many bridges are in Indiana?

Indiana has 18,630 public highway bridges tracked in the FHWA National Bridge Inventory. View detailed condition data for each bridge on PlainBridges.

What percentage of bridges in Indiana are structurally deficient?

4.9% of bridges in Indiana are classified as structurally deficient by the FHWA, compared to a national average of 7.0%.

State profile · Below national median SD

Indiana bridge safety

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026

18,630
Public bridges: 36.1%
Good condition: 4.9%
Poor condition: 4.9%
Structurally deficient

Total Bridges

18,630

Public highway bridges in Indiana

Good Condition

36.1%

6,733 bridges rated 7-9

-13.9pp vs 50% benchmark

Poor Condition

4.9%

920 bridges rated 0-4

Structurally Deficient

4.9%

920 bridges flagged for repair priority

-2.1pp vs national avg 7.0%

Indiana vs national bridge condition

Indiana — Good condition share 36.1%

National avg

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

Indiana — Structurally deficient share 16.5%

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 — Indiana (FHWA NBI)

Counties (92)

Adams 191 Allen 601 Bartholomew 263 Benton 147 Blackford 56 Boone 235 Brown 34 Carroll 159 Cass 161 Clark 144 Clay 144 Clinton 205 Crawford 117 Daviess 205 DeKalb 147 Dearborn 139 Decatur 141 Delaware 272 Dubois 214 Elkhart 272 Fayette 98 Floyd 144 Fountain 195 Franklin 158 Fulton 82 Gibson 348 Grant 278 Greene 233 Hamilton 440 Hancock 189 Harrison 124 Hendricks 341 Henry 192 Howard 194 Huntington 183 Jackson 308 Jasper 186 Jay 124 Jefferson 151 Jennings 148 Johnson 213 Knox 282 Kosciusko 145 LaGrange 100 LaPorte 229 Lake 488 Lawrence 158 Madison 297 Marion 964 Marshall 185 Martin 104 Miami 165 Monroe 226 Montgomery 241 Morgan 241 Newton 167 Noble 88 Ohio 41 Orange 133 Owen 143 Parke 195 Perry 146 Pike 164 Porter 280 Posey 205 Pulaski 100 Putnam 284 Randolph 253 Ripley 188 Rush 223 Scott 113 Shelby 243 Spencer 241 St. Joseph 228 Starke 85 Steuben 134 Sullivan 208 Switzerland 62 Tippecanoe 329 Tipton 109 Union 58 Vanderburgh 286 Vermillion 125 Vigo 294 Wabash 189 Warren 136 Warrick 183 Washington 173 Wayne 342 Wells 155 White 214 Whitley 112

Indiana 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 Indiana on the same metric.

Arkansas

4.71% top marginal rate

Structure: Progressive
Burden @ $100K: $5,544

Washington

4.81% top marginal rate

Structure: Progressive
Burden @ $100K: $8,808

Selected

Indiana

4.94% top marginal rate

Structure: Progressive
Burden @ $100K: $18,630

Kansas

5.25% top marginal rate

Structure: Progressive
Burden @ $100K: $23,867

Wyoming

5.41% top marginal rate

Structure: Progressive
Burden @ $100K: $3,181

Bridges Needing Most Attention in Indiana

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

MOUNT LIBERTY ROAD

Structurally Deficient

Over: MOUNT LIBERTY CREEK

00.10 S 4 MILE RD, Brown, IN

Built 1929 Load: 2.7 t ADT: 150

CR 250W

Poor

Over: JONES CREEK

00.70 S of CR 250 N, Putnam, IN

Built 1925 Load: 2.7 t ADT: 180

CR 675W

Structurally Deficient

Over: BRANCH OF LEATHERMAN CR

00.20 S of CR 125 N, Putnam, IN

Built 1930 Load: 2.7 t ADT: 130

CR 275S

Structurally Deficient

Over: CONRAIL RR

00.50 E of CR 600 W, Putnam, IN

Built 1910 Load: 2.7 t ADT: 130

SHAPED CHARGE ROAD

Poor

Over: LITTLE OTTER CREEK

1.2 MILES NORTH OF K RD, Ripley, IN

Built 1899 Load: 2.7 t ADT: 2

WONJU ROAD

Poor

Over: TRIBUTARY OF BIG CREEK

0.3 MILE NORTH OF G ROAD, Ripley, IN

Built 1990 Load: 2.7 t ADT: 10

All Bridges in Indiana

Sort by:

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

Indiana vs national bridge condition

Condition Distribution

Counties (92)

Bridges Needing Most Attention in Indiana

MOUNT LIBERTY ROAD

CR 250W

CR 675W

CR 275S

SHAPED CHARGE ROAD

WONJU ROAD

All Bridges in Indiana

CLARK STREET

HARRISON STREET

I-80 EB

RAMP L-WB TO SR 51

I-90

I-90 ON RAMP

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

912WB RAMP TO I-90

I-90 EB RAMP TO 91

I-90 EB

I-90 WB

I-90 EB

I-90 WB

141ST STREET

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EBL

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

I-90 WB

CSS & SB RR

I-90 RAMP TO SR 91

I-90 EB

I-90 WBL

I-90 EB

I-90 WB

I-90 EB

I-90 WB

I-90 EB

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