Marion County, IN

964 public highway bridges

Marion County Bridge Snapshot

Marion County, Indiana contains 964 public highway bridges in the FHWA National Bridge Inventory. Roughly 27% are rated “Good,” 36% “Fair,” 3.7% “Poor,” and 3.7% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IN are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

964

Total Bridges

27%

Good

3.7%

Poor

3.7%

Structurally Deficient

Condition Distribution

Good

27% (260)

Fair

36% (347)

Poor

3.7% (36)

SD

3.7% (36)

All Bridges (964)

Sort:

CARSON AVENUE

Over: I-465 EBL & RAMP

01.96 E US 31, Marion, IN

Built 2022 ADT: 46,611

SERVICE ROAD

Over: WEST TUNNEL

00.00 STATE FAIRGROUNDS, Marion, IN

Built 1995 ADT: 133

TRACK OF CHAMPIONS

Over: EAST TUNNEL ROADWAY

00.00 STATE FAIRGROUNDS, Marion, IN

Built 1936 ADT: 118

WESTFIELD BLVD

Over: I465 WBL

00.82 W SR 431, Marion, IN

Built 2010 ADT: 62,929

W 10TH STREET

Over: I-465 NB

01.05 N US 36, Marion, IN

Built 2009 ADT: 76,190

I-465 NB

Over: MINNESOTA ST EB & WB

00.38 S US 40, Marion, IN

Built 2009 ADT: 1,800

I-465 SB

Over: MINNESOTA ST

00.38 S US 40, Marion, IN

Built 2009 ADT: 1,800

NORTH RIVER ROAD

Over: I465 EBL

02.84 W I-69, Marion, IN

Built 2010 ADT: 74,728

WEST HANNA AVENUE

Over: I-465 NB

00.44 S I-70, Marion, IN

Built 2009 ADT: 54,230

W 34TH STREET

Over: I-465 NB

00.71 N I-74, Marion, IN

Built 2008 ADT: 67,873

W 46TH STREET

Over: I-465 NB

01.81 S OF I-65, Marion, IN

Built 2008 ADT: 58,749

US 36/ROCKVILLE RD

Over: I-465 SB

06.98 E SR 267, Marion, IN

Built 2009 ADT: 71,031

W 21ST STREET

Over: I-465 SB

00.80 S I-74, Marion, IN

Built 2009 ADT: 74,625

W 38TH STREET

Over: I-465 NB RAMP

01.23 N I-74, Marion, IN

Built 2008 ADT: 4,256

I-70

Over: SHERMAN DRIVE

03.91 W I-465, Marion, IN

Built 2007 ADT: 10,375

I-465 EB

Over: KEYSTONE AVE SBL RAMP

03.16 E US 31, Marion, IN

Built 2010 ADT: 10,000

I-465 WB

Over: KEYSTONE AVE NBL RAMP

03.16 E US 31, Marion, IN

Built 2010 ADT: 10,000

I-465 NB

Over: US 40/WASHINGTON ST EBL

02.15 S US 36, Marion, IN

Built 2009 ADT: 13,178

I-465 SB

Over: US 40/WASHINGTON ST WBL

02.15 S US 36, Marion, IN

Built 2009 ADT: 13,260

I-465 EB

Over: COLLEGE AVE

00.64 E US 31, Marion, IN

Built 2010 ADT: 12,437

I-465 WB

Over: COLLEGE AVE

00.64 E US 31, Marion, IN

Built 2010 ADT: 12,437

I465 NB to I70 WB

Over: I-70 EB

00.13 E I-465, Marion, IN

Built 2011 ADT: 21,150

RAMP I70 EB-I465NB

Over: I-465 SB CD

00.79 N SR 67, Marion, IN

Built 2011 ADT: 6,015

I-70 EB

Over: I-465 SB CD

06.53 E SR 267, Marion, IN

Built 2011 ADT: 14,325

I-70 WB

Over: I-465 SB CD

06.53 E SR 267, Marion, IN

Built 2011 ADT: 14,325

SAM JONES EXPRWY

Over: I-465 SB

01.28 S US 40, Marion, IN

Built 2011 ADT: 56,731

I-70 EB

Over: RAMP I-70 EB to I-465 NB

00.08 E I-465, Marion, IN

Built 2011 ADT: 19,625

I-70 WB

Over: RAMP I-70 EB to I-465 NB

00.08 E I-465, Marion, IN

Built 2011 ADT: 19,625

E 75TH STREET

Over: I-465 SBL

00.39 S I-69, Marion, IN

Built 2011 ADT: 97,835

E 82ND STREET EB

Over: I-465 EBL

02.54 E SR 431, Marion, IN

Built 2012 ADT: 68,999

E 82ND STREET WB

Over: I-465 WBL

02.54 E SR 431, Marion, IN

Built 2012 ADT: 76,325

SR 37 NBL

Over: COUNTY LINE ROAD WBL

04.45 S I-465, Marion, IN

Built 2023 ADT: 11,250

SR 37 SBL

Over: COUNTY LINE ROAD WBL

04.45 S I-465, Marion, IN

Built 2022 ADT: 11,250

SR 37 NBL

Over: WICKER ROAD

03.86 S I-465, Marion, IN

Built 2023 ADT: 3,300

SR 37 SBL

Over: WICKER ROAD

03.86 S I-465, Marion, IN

Built 2022 ADT: 3,300

MADISON AVENUE

Over: I-465 EB

00.57 E US 31, Marion, IN

Built 2022 ADT: 59,987

SR 37 NBL

Over: BANTA ROAD

1.75 S I-465, Marion, IN

Built 2022 ADT: 7,800

SOUTHPORT ROAD

Over: SR 37 (I-69) SBL

2.33 S I-465, Marion, IN

Built 2022 ADT: 36,900

I-65 NB

Over: WASHINGTON STREET

00.92 N I-70, Marion, IN

Built 2022 ADT: 30,000

I-65 SB

Over: WASHINGTON STREET

00.92 N I-70, Marion, IN

Built 2022 ADT: 30,000

I-65 SB

Over: EAST TENTH STREET

01.92 N I-70, Marion, IN

Built 2023 ADT: 6,850

I-70 WB & I-65 SB

Over: EAST 10TH STREET

00.52 E I-65, Marion, IN

Built 2023 ADT: 6,850

I-65 SB

Over: I-70 WB & I-70 WB-CD

02.21 N I-70, Marion, IN

Built 2023 ADT: 36,289

I-65 NB

Over: I-70 WB & I-70 WB CD Ram

02.21 N I-70, Marion, IN

Built 2023 ADT: 11,856

I-65 NBL Ramp from

Over: I-65 NBL Mainline Ramp

02.12 N I-70, Marion, IN

Built 2023 ADT: 34,480

I-70 EB Ramp from

Over: I-65 NB Mainline Ramp

00.48 E I-65, Marion, IN

Built 2023 ADT: 34,480

ROCK ISLAND ACCESS

Over: 86TH ST

00.58 E ZIONSVILLE ROAD, Marion, IN

Built 1995 ADT: 369

38TH STREET WB

Over: GUION ROAD

00.15 E I-65, Marion, IN

Built 1964 ADT: 10,600

38TH STREET EB

Over: GUION ROAD

00.50 E OF LAFAYETTE ROAD, Marion, IN

Built 1964 ADT: 10,600

38TH STREET EB

Over: CENTRAL CANAL TRAIL

00.35 W OF MICHIGAN ROAD, Marion, IN

Built 1960 ADT: 10

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

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