Total bridges
624
Public highway bridges in McLean County
County profile · official public datasets
McLean County, IL
624 public highway bridges tracked in the FHWA National Bridge Inventory: 60.9% rated Good, 36.2% Fair, 2.9% Poor.
- 624
- Public bridges
- 60.9%
- Good condition
- 2.9%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
McLean County posts a top-10% lowest Poor-condition share among rated counties in the state across large county bridge inventory.
- Top 6%
- lowest Poor share in state
- 2.9%
- Poor-condition share
- 624
- public highway bridges
- 1981
- 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.
McLean County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, McLean County ranks #6 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.9%). McLean County, Illinois contains 624 public highway bridges. Roughly 60.9% are rated “Good,” 36.2% “Fair,” and 2.9% “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
60.9%
380 of 624 rated 7-9
Fair condition
36.2%
226 of 624 rated 5-6
Poor condition
2.9%
18 of 624 rated 4 or below
In-state Poor-share rank
#6 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 624 NBI-tracked bridges by lowest applicable component rating.
Good 60.9% (380)
Fair 36.2% (226)
Poor 2.9% (18)
McLean County's Poor-condition bridges carry 69,775 vehicle crossings a day
That is 3.7% of the county's reported daily bridge traffic on 2.9% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 3,876 crossings a day against 1,624 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 624 of 624 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
39.7% of McLean County's bridges have passed the 50-year mark
248 of the 624 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 60.9% 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 35.8% of the county's Poor-condition bridge traffic
I-55 BUSN LOOP over Norfolk Southern Railway, built 1940, carries 25,000 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 18-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 69,775 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When McLean County's bridges were built
624 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1920s 9
1920–1929
9 bridges
- 1930s 12
1930–1939
12 bridges
- 1940s 11
1940–1949
11 bridges
- 1950s 12
1950–1959
12 bridges
- 1960s
1960–1969
131 bridges
- 1970s
1970–1979
125 bridges
- 1980s
1980–1989
110 bridges
- 1990s
1990–1999
90 bridges
- 2000s
2000–2009
65 bridges
- 2010s 50
2010–2019
50 bridges
- 2020s 8
2020–2029
8 bridges
What this shows Construction peaked in the 1960s, when 131 of the county's bridges still in the inventory were built, which is 21% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1981) matches the Illinois average (1979).
How McLean County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest McLean County in number of bridges, with their condition splits. Its 2.9% Poor share is the 1st-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1980 is in line with the group.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Will County | 649 | 43.1% | 46.4% | 10.5% | 1983 |
| McLean County (this page) | 624 | 60.9% | 36.2% | 2.9% | 1981 |
| Livingston County | 579 | 51.8% | 39.9% | 8.3% | 1978 |
| Iroquois County | 570 | 46.5% | 39.1% | 14.4% | 1980 |
| LaSalle County | 528 | 39.4% | 48.3% | 12.3% | 1978 |
| Madison County | 523 | 49.3% | 42.3% | 8.4% | 1979 |
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 McLean 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 McLean County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (624 bridges here).
- Steuben County, NY · 627 bridges
- Westmoreland County, PA · 620 bridges
- Contra Costa County, CA · 618 bridges
- Brazoria County, TX · 618 bridges
Similar average build year
Nearest mean year-built outside IL (1981 here).
- Franklin County, OH · avg 1981 · 922 bridges
- Greenville County, SC · avg 1981 · 635 bridges
- Montgomery County, OH · avg 1981 · 632 bridges
- Shawnee County, KS · avg 1981 · 563 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (624)
TR 483
FairOver: TIMBER CREEK
1.2 MI W FUNKS GROVE, McLean, IL
Built 1980 Load: 32.4 t ADT: 75
TR 98
FairOver: SUGAR CREEK
2.0 MI N FUNKS GROVE, McLean, IL
Built 1980 Load: 32.4 t ADT: 50
CH 37/FAS 480
FairOver: SIX MILE CR
1.0 MI SE HUDSON, McLean, IL
Built 1989 Load: 32.4 t ADT: 2,550
TR 496
FairOver: MACKINAW RIVER
3.5 MI W COLFAX, McLean, IL
Built 1980 Load: 32.4 t ADT: 75
FAS 479 CH 59
FairOver: SUGAR CREEK
1.5 MI NNW MCLEAN, McLean, IL
Built 1975 Load: 32.4 t ADT: 425
TR 345
FairOver: BR KICKAPOO CREEK
3.5 MI NE DOWNS, McLean, IL
Built 1981 Load: 32.4 t ADT: 25
TR 546
FairOver: BRANCH SALT CREEK
3.5 MI NW BELLFLOWER, McLean, IL
Built 1959 Load: 32.4 t ADT: 75
TR 512
FairOver: ROOKS CREEK TR 512
2.0 MI WNW WESTON, McLean, IL
Built 1982 Load: 32.4 t ADT: 75
TR 522
FairOver: ROOKS CREEK
1.0 MI W WESTON, McLean, IL
Built 1982 Load: 32.4 t ADT: 75
TR 548 A
FairOver: ROOKS CREEK
3.8 MI SSE WESTON, McLean, IL
Built 1983 Load: 32.4 t ADT: 75
HERSHEY RD FAU 641
FairOver: BROOKRIDGE CREEK
1.5 MI ENE 55 & 150, McLean, IL
Built 1981 Load: 32.4 t ADT: 2,675
FAU6363 OAKLAND AV
FairOver: SOUTHERN PACIFIC RR
1.2 MI SE 74 & 150, McLean, IL
Built 1991 Load: 32.4 t ADT: 4,750
ADELAIDE ST-FAU 63
FairOver: PHEASANT CREEK
1.4 MI NNW 150 & 51, McLean, IL
Built 1955 Load: 32.4 t ADT: 2,250
HOVEY AVE FAU 6353
FairOver: PHEASANT CREEK
1.2 MI NNW 51 & 150, McLean, IL
Built 1964 Load: 32.4 t ADT: 7,850
BLAIR DR
FairOver: SUGAR CREEK
1.7 MI NNW BUS55 & 9, McLean, IL
Built 1991 Load: 32.4 t ADT: 1,400
TOWANDA AVE
FairOver: SOUTHERN PACIFIC RR
2.4 MI NNW BUS55 & 9, McLean, IL
Built 1994 Load: 32.4 t ADT: 13,700
COLLEGE AVE
FairOver: N FORK SUGAR CR
1.8 MI NE 9/BUS51, McLean, IL
Built 2008 Load: 32.4 t ADT: 12,200
I-74
FairOver: ROCK CREEK
7.2 MI E OF ILL 117, McLean, IL
Built 1964 Load: 32.7 t ADT: 14,200
I-74
FairOver: ROCK CREEK
7.2 MI E OF ILL 117, McLean, IL
Built 1964 Load: 32.7 t ADT: 14,200
FAS 489 CH 21
FairOver: N FORK SALT CREEK
2.0 MI N LEROY, McLean, IL
Built 1933 Load: 32.7 t ADT: 1,450
FAS 493 CH 5
FairOver: SANGAMON RIVER
0.5 MI S SAYBROOK, McLean, IL
Built 1937 Load: 33.0 t ADT: 675
CH-8 (FAS-473)
FairOver: MACKINAW RIVER
1.0 MI W CLARKSVILLE, McLean, IL
Built 1946 Load: 33.0 t ADT: 575
TR 90
FairOver: I-74
8.3 MI E OF ILL 117, McLean, IL
Built 1964 Load: 33.4 t ADT: 75
FAU 6431/CH 29
FairOver: I-55
.5 MI N OF TOWANDA, McLean, IL
Built 1974 Load: 33.4 t ADT: 3,650
FAS 482 CH 36
FairOver: TIMBER CR
0.5 MIE FUNKS GROVE, McLean, IL
Built 1976 Load: 33.4 t ADT: 75
FAS 356 CH 23
FairOver: TURKEY CREEK
1.0 MI N LEXINGTON, McLean, IL
Built 1932 Load: 34.0 t ADT: 800
TR 201
FairOver: I-74
4 MILES W OF I-55, McLean, IL
Built 1964 Load: 34.3 t ADT: 75
I-39 SB
FairOver: NORTHTOWN RD TR 201B
O.53 MI N OF I-55, McLean, IL
Built 1988 Load: 34.3 t ADT: 6,750
I-39 NB
FairOver: NORTHTOWN RD TR 201B
0.32 MI W OF OLD 51, McLean, IL
Built 1988 Load: 34.3 t ADT: 6,750
Raab Rd (FAU 6346)
FairOver: I-55 & I-74
3 MI N OF ILL 9, McLean, IL
Built 1990 Load: 34.3 t ADT: 3,000
FAS 489 CH 21
FairOver: MACKINAW RIVER
1.0 MI SW LEXINGTON, McLean, IL
Built 1964 Load: 34.7 t ADT: 775
TOWANDA AVE
FairOver: SUGAR CREEK
1.0 MI NNW 55 & 9, McLean, IL
Built 1970 Load: 34.7 t ADT: 4,850
FAS 482 CH 41
FairOver: BRANCH TIMBER CREEK
3.0MI ENE FUNKSGROVE, McLean, IL
Built 1974 Load: 35.0 t ADT: 225
COUNTY ROAD TR 76
FairOver: I-74
6.65 MI E OF ILL 117, McLean, IL
Built 1964 Load: 35.3 t ADT: 75
TR 210
FairOver: I-74/S.OF BLOOMNGTN
1 MILE E OF BUSN 55, McLean, IL
Built 1964 Load: 35.3 t ADT: 450
US 136
FairOver: SALT CREEK
5.5 MI E OF US 150, McLean, IL
Built 1989 Load: 35.3 t ADT: 1,000
FAS 1477 CH 40
FairOver: SALT CREEK
1.0 MI NE LEROY, McLean, IL
Built 1974 Load: 35.6 t ADT: 600
I-74 EB
FairOver: US 51/S.OF BLOOMNGTN
US 51 INTERCHANGE, McLean, IL
Built 1963 Load: 36.0 t ADT: 9,500
I-74 WB
FairOver: US 51/S.OF BLOOMNGTN
US 51 INTERCHANGE, McLean, IL
Built 1963 Load: 36.0 t ADT: 9,500
IL 251 FAS 255
FairOver: MACKINAW RIVER
5.5 M S OF US 24, McLean, IL
Built 1991 Load: 36.0 t ADT: 2,150
FAS481CH32
FairOver: BRANCH SUGAR CK
2.5 MI ESE STANFORD, McLean, IL
Built 1994 Load: 36.0 t ADT: 900
FAP 412 US 51(SB)
FairOver: US 136
0.51 MI W OF OLD 51, McLean, IL
Built 1986 Load: 36.3 t ADT: 9,650
FAP 412 US 51(NB)
FairOver: US 136
0.5 MI W OF OLD 51, McLean, IL
Built 1986 Load: 36.3 t ADT: 9,650
ILL 165
FairOver: BR MACKINAW RIVER
14.2 MI N OF ILL 9, McLean, IL
Built 1990 Load: 36.3 t ADT: 750
I-74 EB
FairOver: N FORK SALT CREEK
14.86 MI E OF US 51, McLean, IL
Built 1970 Load: 36.6 t ADT: 10,750
I-74 WB
FairOver: N FORK SALT CREEK
14.86 MI E OF US 51, McLean, IL
Built 1970 Load: 36.6 t ADT: 10,750
ILL 165
FairOver: BR MACKINAW RIVER
10.9 MI N OF ILL 9, McLean, IL
Built 1990 Load: 36.6 t ADT: 750
SBI 119 SP#2488
FairOver: W FK SALT CREEK
1.5 MI S OF I-74, McLean, IL
Built 1989 Load: 36.9 t ADT: 700
TR 239 B
FairOver: BR OF MACKINAW RIV
3.5 MI S ANCHOR, McLean, IL
Built 1933 Load: 36.9 t ADT: 75
FAS 1478
FairOver: I-74 AT LEROY
13.63 MI E OF US 51, McLean, IL
Built 1970 Load: 37.6 t ADT: 5,850
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.