Total bridges
958
Public highway bridges in Marion County
County profile · official public datasets
Marion County, IN
958 public highway bridges tracked in the FHWA National Bridge Inventory: 45.9% rated Good, 49.5% Fair, 4.6% Poor.
- 958
- Public bridges
- 45.9%
- Good condition
- 4.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Marion County posts a better-than-median Poor-condition share among rated counties in the state across large county bridge inventory.
- Top 47%
- lowest Poor share in state
- 4.6%
- Poor-condition share
- 958
- public highway bridges
- 1976
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Marion County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Marion County ranks #43 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.6%). Marion County, Indiana contains 958 public highway bridges. Roughly 45.9% are rated “Good,” 49.5% “Fair,” and 4.6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Good condition
45.9%
440 of 958 rated 7-9
Fair condition
49.5%
474 of 958 rated 5-6
Poor condition
4.6%
44 of 958 rated 4 or below
In-state Poor-share rank
#43 of 92
Among Indiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 958 NBI-tracked bridges by lowest applicable component rating.
Good 45.9% (440)
Fair 49.5% (474)
Poor 4.6% (44)
Marion County's Poor-condition bridges carry 697,793 vehicle crossings a day
That is 2.7% of the county's reported daily bridge traffic on 4.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 15,859 crossings a day against 30,399 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 958 of 958 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
60.3% of Marion County's bridges have passed the 50-year mark
578 of the 958 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 45.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
One structure carries 18.5% of the county's Poor-condition bridge traffic
I-465 over DELAWARE CREEK, built 1966, carries 129,314 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 44-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 697,793 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Marion County's bridges were built
958 bridges with a recorded construction year, grouped by decade
- pre-1900 1
Built before 1900
1 bridges
- 1900s 12
1900–1909
12 bridges
- 1910s 12
1910–1919
12 bridges
- 1920s 24
1920–1929
24 bridges
- 1930s 24
1930–1939
24 bridges
- 1940s 19
1940–1949
19 bridges
- 1950s 86
1950–1959
86 bridges
- 1960s
1960–1969
276 bridges
- 1970s
1970–1979
159 bridges
- 1980s 47
1980–1989
47 bridges
- 1990s 72
1990–1999
72 bridges
- 2000s 96
2000–2009
96 bridges
- 2010s 56
2010–2019
56 bridges
- 2020s 74
2020–2029
74 bridges
What this shows Construction peaked in the 1960s, when 276 of the county's bridges still in the inventory were built, which is 28.8% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1976) matches the Indiana average (1978).
How Marion County compares with Indiana's closest counties by inventory size
The 5 Indiana counties nearest Marion County in number of bridges, with their condition splits. Its 4.6% Poor share is the 4th-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1984 is 8 years older.
Showing the 5 closest of 91 Indiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Marion County (this page) | 958 | 45.9% | 49.5% | 4.6% | 1976 |
| Allen County | 613 | 41.6% | 51.5% | 6.9% | 1978 |
| Lake County | 501 | 51.1% | 42.9% | 6% | 1984 |
| Hamilton County | 454 | 68.3% | 29.1% | 2.6% | 1996 |
| Gibson County | 362 | 42.8% | 53% | 4.1% | 1978 |
| Hendricks County | 355 | 41.4% | 56.3% | 2.3% | 1982 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Marion County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Marion County, both outside Indiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IN (958 bridges here).
- Santa Clara County, CA · 964 bridges
- Hennepin County, MN · 936 bridges
- Jackson County, MO · 930 bridges
- Denton County, TX · 991 bridges
Similar average build year
Nearest mean year-built outside IN (1976 here).
- Mohave County, AZ · avg 1976 · 641 bridges
- Comanche County, OK · avg 1976 · 593 bridges
- Prince George's County, MD · avg 1976 · 576 bridges
- New Castle County, DE · avg 1976 · 527 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (474)
I-465 SB
FairOver: I-69 SR 37
04.56 N US 36 / SR 67, Marion, IN
Built 1968 Load: 33.7 t ADT: 63,828
GEORGETOWN RD
FairOver: DRY RUN DIVERSION
00.32 S OF 30TH ST, Marion, IN
Built 1964 Load: 33.7 t ADT: 23,217
BANTA ROAD
FairOver: LITTLE BUCK CREEK
00.15 E OF BLUFF ROAD, Marion, IN
Built 1966 Load: 33.7 t ADT: 4,883
US 136
FairOver: EAGLE CREEK
00.13 E SR 134, Marion, IN
Built 1960 Load: 33.8 t ADT: 17,155
COFFMAN RD
FairOver: LITTLE EAGLE CREEK
00.35 N OF 62ND ST, Marion, IN
Built 1979 Load: 33.8 t ADT: 4,494
INDIAN CREEK ROAD
FairOver: WILDCAT BROOK
00.17 W OF ACTON ROAD, Marion, IN
Built 1939 Load: 33.9 t ADT: 464
I-65 SB
FairOver: I-65 RAMPS (5670)
03.61 N I-70, Marion, IN
Built 1970 Load: 34.0 t ADT: 47,275
I-65
FairOver: CLIFTON STREET
06.00 N I-70, Marion, IN
Built 1968 Load: 34.0 t ADT: 99,834
I-70
FairOver: I-70 OFF/ ON RAMPS
00.77 W I-65, Marion, IN
Built 1973 Load: 34.0 t ADT: 137,908
W 56TH STR EB
FairOver: I-465 NB/SB
00.79 S I-65, Marion, IN
Built 1995 Load: 34.0 t ADT: 15,048
I-70
FairOver: DIVISION STREET
02.13 W I-65, Marion, IN
Built 1973 Load: 34.1 t ADT: 143,345
CALVARY STREET
FairOver: I-65 SB
00.29 N I-70, Marion, IN
Built 1973 Load: 34.3 t ADT: 5,000
I-465 SB
FairOver: FALL CREEK ROAD
02.00 S I-69, Marion, IN
Built 1968 Load: 34.3 t ADT: 101,476
42ND STREET
FairOver: STEELE DITCH
00.48 E OF GERMAN CHURCH, Marion, IN
Built 1974 Load: 34.3 t ADT: 605
THOMPSON RD
FairOver: STATE DITCH
00.58 E OF MANN RD, Marion, IN
Built 1916 Load: 34.3 t ADT: 233
TULANE RD
FairOver: DELAWARE CREEK
00.12 W OF TOWNSHIP LINE, Marion, IN
Built 1975 Load: 34.3 t ADT: 1,031
KEYSTONE AVENUE
FairOver: HOWLAND DITCH
00.15 N OF 71ST STREET, Marion, IN
Built 1960 Load: 34.3 t ADT: 54,496
MERIDIAN STREET
FairOver: FALL CREEK
00.45 S OF 30TH STREET, Marion, IN
Built 1917 Load: 34.3 t ADT: 25,289
POST ROAD
FairOver: I-70 EB/WB WBL RAMP
01.34 E I-465, Marion, IN
Built 1967 Load: 34.7 t ADT: 48,003
10TH STREET
FairOver: WHITE RIVER
00.70 W OF INDIANA AVENUE, Marion, IN
Built 1979 Load: 34.7 t ADT: 29,346
CARROLL ROAD
FairOver: BRIER CREEK
00.45 N OF BROOKVILLE RD, Marion, IN
Built 1995 Load: 34.7 t ADT: 3,185
MARLIN ROAD
FairOver: BUCK CREEK
00.60 E OF SENOUR ROAD, Marion, IN
Built 1959 Load: 34.7 t ADT: 697
RALSTON RD
FairOver: GOOSE CREEK
00.70 W OF MANN RD, Marion, IN
Built 1961 Load: 34.7 t ADT: 1,560
91ST ST
FairOver: WILLIAMS CREEK
00.45 W OF SPRING MILL RD, Marion, IN
Built 1974 Load: 34.9 t ADT: 12,965
OHIO ST
FairOver: INDPLS WATER CO CANAL
00.40 W OF MERIDIAN ST, Marion, IN
Built 1986 Load: 34.9 t ADT: 7,832
I-69 NB
FairOver: EAST 82ND STREET
00.84 N I-465, Marion, IN
Built 1969 Load: 35.0 t ADT: 78,095
I-70
FairOver: CSX WYE TRACKS
03.88 E I-465, Marion, IN
Built 1967 Load: 35.0 t ADT: 109,416
SR 134
FairOver: MARIO CREEK
00.03 S US 136, Marion, IN
Built 1974 Load: 35.3 t ADT: 13,393
MORRIS ST/ PROSPEC
FairOver: I-65 SB RAMP W-S
00.13 S I-70, Marion, IN
Built 1973 Load: 35.3 t ADT: 3,918
VIRGINIA AVENUE
FairOver: I-65 NB/I-70 EB
00.18 N I-70, Marion, IN
Built 1973 Load: 35.3 t ADT: 12,710
I-70 EB/WB
FairOver: I-70 EB EXIT RAMP
00.93 W I-65, Marion, IN
Built 1974 Load: 35.3 t ADT: 137,908
I-70 EB
FairOver: GRASSY CREEK
03.11 E I-465, Marion, IN
Built 1967 Load: 35.3 t ADT: 31,813
I-70 WB
FairOver: GRASSY CREEK
03.11 E I-465, Marion, IN
Built 1967 Load: 35.3 t ADT: 31,813
MOORESVILLE RD
FairOver: STATE DITCH
00.23 E OF MANN RD, Marion, IN
Built 1965 Load: 35.3 t ADT: 6,487
BLUFF RD
FairOver: LITTLE BUCK CREEK
00.20 NE OF SOUTHPORT RD, Marion, IN
Built 1995 Load: 35.3 t ADT: 21,344
WASHINGTON STREET
FairOver: BIG EAGLE CREEK
0.10 MI E OF ROCKVILLE RD, Marion, IN
Built 1938 Load: 35.3 t ADT: 25,347
COUNTRY CLUB RD
FairOver: COX DITCH
00.65 N OF ROCKVILLE RD, Marion, IN
Built 1973 Load: 35.4 t ADT: 10,222
42ND STREET
FairOver: STEELE DITCH
00.33 E OF GERMAN CHURCH, Marion, IN
Built 1974 Load: 35.5 t ADT: 605
KEYSTONE AVE
FairOver: LICK CREEK
00.15 N I-465, Marion, IN
Built 1962 Load: 35.6 t ADT: 9,207
MITTHOEFER ROAD
FairOver: WILDCAT RUN
00.05 S OF MCGREGOR RD, Marion, IN
Built 1991 Load: 35.6 t ADT: 460
I-465 NB
FairOver: I-69 SR 37
04.56 N US 36 / SR 67, Marion, IN
Built 1968 Load: 36.0 t ADT: 60,828
I-65 NB RAMP
FairOver: I-465 SB
00.16 S I-65, Marion, IN
Built 1959 Load: 36.0 t ADT: 11,933
WESTFIELD BLVD
FairOver: WHITE RIVER
01.05 S OF 75th ST, Marion, IN
Built 1979 Load: 36.1 t ADT: 15,512
US 40
FairOver: LITTLE WHITE LICK CREEK
03.35 W I-465, Marion, IN
Built 1941 Load: 36.3 t ADT: 31,078
SHADELAND AVENUE
FairOver: CONRAIL RR
00.25 N OF MASSACHUSETTS, Marion, IN
Built 1936 Load: 36.3 t ADT: 25,725
NEW YORK ST
FairOver: WHITE RIVER
.9 MILE WEST OF MLK JR ST, Marion, IN
Built 1972 Load: 36.3 t ADT: 9,570
CONSERVATORY DRIVE
FairOver: PLEASANT RUN
00.05 SE OF PLSNT RUN PKW, Marion, IN
Built 1907 Load: 36.3 t ADT: 1,275
EMERSON AVENUE
FairOver: LICK CREEK
00.15 S OF RAYMOND STREET, Marion, IN
Built 1970 Load: 36.3 t ADT: 18,978
EMERSON AVE
FairOver: BEECH CREEK
00.70 N I-465, Marion, IN
Built 1970 Load: 36.3 t ADT: 42,339
THOMPSON ROAD
FairOver: I-65
00.62 S I-465, Marion, IN
Built 1971 Load: 36.6 t ADT: 14,283
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.