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)
US 136
FairOver: I-74
2.75 MI SE OF LEROY, McLean, IL
Built 1970 Load: 37.6 t ADT: 1,250
I-55 NBL
FairOver: I-55 BUSN LOOP
NBL OVR 55 BUSN LOOP, McLean, IL
Built 2010 Load: 37.6 t ADT: 10,650
FAU-6365 (LincolnS
FairOver: Broadmoor Creek
1.2 MI NE 55 & 150, McLean, IL
Built 1968 Load: 37.6 t ADT: 3,600
TR 23
FairOver: I-55
1 MI S OF CHENOA, McLean, IL
Built 1972 Load: 37.9 t ADT: 75
CARLOCK ROAD
FairOver: I-74
7.70 MI E OF ILL 117, McLean, IL
Built 1964 Load: 38.2 t ADT: 1,200
US 136
FairOver: BRANCH SALT CREEK
12.17 M E OF US 51, McLean, IL
Built 1976 Load: 38.2 t ADT: 1,250
ILL 165
FairOver: MACKINAW CREEK
15.8 MI NE ILL 9, McLean, IL
Built 1928 Load: 38.6 t ADT: 1,350
FAS 356 CH 23
FairOver: I-55
1 MI NW OF LEXINGTON, McLean, IL
Built 1973 Load: 38.6 t ADT: 1,100
ILL 9
FairOver: BRAYS CREEK
.83 E OF ARROWSMITH, McLean, IL
Built 1980 Load: 38.6 t ADT: 1,500
US 150/FAP 676& SP
FairOver: NS Railway & White Oak R
2.9 MI N OF ILL 9, McLean, IL
Built 1987 Load: 38.9 t ADT: 9,350
CH 8 & FAS 473 CH
FairOver: I-39/US 51
1 MI S WOODFORD CO., McLean, IL
Built 1989 Load: 38.9 t ADT: 1,175
I-55 SB
FairOver: TIMBER CR
1 MI N OF FUNKSGROVE, McLean, IL
Built 1975 Load: 39.5 t ADT: 11,050
I-55 NB
FairOver: TIMBER CR
1 MI N OF FUNKSGROVE, McLean, IL
Built 1975 Load: 39.5 t ADT: 11,050
US 51
FairOver: TRIB OF TIMBER CREEK
1.45 MI S OF FAI-74, McLean, IL
Built 1985 Load: 39.5 t ADT: 11,900
I-55 BUSN LOOP
FairOver: Union Pacific RR & Old 6
2.8 MI N OF ILL 9, McLean, IL
Built 1939 Load: 40.2 t ADT: 21,300
I-55 NB
FairOver: US 136/FAP 315
MCLEAN, McLean, IL
Built 1975 Load: 40.5 t ADT: 10,800
TR 157A
FairOver: I-39/US 51 SUBSTA RD
2.5 MI N OF I-55, McLean, IL
Built 1989 Load: 40.5 t ADT: 250
US 150
FairOver: SALT CREEK (N FORK)
0.8 MI S OF LEROY, McLean, IL
Built 2004 Load: 40.5 t ADT: 900
I-55 NB
FairOver: US 51B (Main St)
INTER I 55 & US 51B, McLean, IL
Built 1962 Load: 40.8 t ADT: 15,750
I-55 BUSN LOOP
FairOver: US 51 AT BLOOMINGTON
JCT BUSN 55 & US 51, McLean, IL
Built 1939 Load: 40.8 t ADT: 25,000
US 150
FairOver: FAI 74
OVER I-74 NW NORMAL, McLean, IL
Built 1964 Load: 40.8 t ADT: 2,600
TR 390
FairOver: I-74/2 MI W OF LEROY
2 MI NW OF LEROY, McLean, IL
Built 1970 Load: 41.1 t ADT: 75
TR#181 (BUSN. 51)
FairOver: I-39/US 51
0.22 MI W OF OLD 51, McLean, IL
Built 1988 Load: 41.1 t ADT: 1,550
US 51 SB CENTER ST
FairOver: Norfolk Southern Railway
US 51 SB IN BLMNGTN, McLean, IL
Built 1971 Load: 41.5 t ADT: 8,800
I-39 RAMP 816 SB
FairOver: I-55
0.35 MI W OF BUS.51, McLean, IL
Built 1988 Load: 41.8 t ADT: 1,700
I-55 BUSN LP NB &
FairOver: SUGAR CR & BIKE PATH
1.1 MI N OF ILL 9, McLean, IL
Built 2000 Load: 41.8 t ADT: 41,100
I-55 SB
FairOver: TURKEY CREEK
1.5 MI SW LEXINGTON, McLean, IL
Built 1973 Load: 42.1 t ADT: 11,900
I-55 NB
FairOver: TURKEY CREEK
1.5 MI NW LEXINGTON, McLean, IL
Built 1973 Load: 42.1 t ADT: 11,900
US 51 SB
FairOver: KICKAPOO CREEK
1 MI N OF US 136, McLean, IL
Built 1986 Load: 42.1 t ADT: 12,300
US 51 NB
FairOver: KICKAPOO CREEK
1 MI N OF US 136, McLean, IL
Built 1986 Load: 42.1 t ADT: 12,300
ILL 9
FairOver: MONEY CREEK
10.15 E OF BISN 55, McLean, IL
Built 1925 Load: 43.1 t ADT: 2,400
I-39 NB
FairOver: I-55 & CD#2284/2287
0.29 MI W OF OLD 51, McLean, IL
Built 1989 Load: 43.1 t ADT: 6,750
FAS 351 CH 1
FairOver: HENLINE DITCH
1.5 MI S CROPSEY, McLean, IL
Built 1990 Load: 43.1 t ADT: 250
FAS-481 (CH-32)
FairOver: Br Sugar Creek
1.5 MI NW SHIRLEY, McLean, IL
Built 1990 Load: 43.4 t ADT: 900
FAS 472 CH 12
FairOver: SIX MILE CREEK
2.0 MI W HUDSON, McLean, IL
Built 1983 Load: 43.4 t ADT: 775
I-55 SB
FairOver: MONEY CREEK
1.5 MI NE OF TOWANDA, McLean, IL
Built 1973 Load: 44.1 t ADT: 11,900
I-55 NB
FairOver: MONEY CREEK
1.5 MI NE OF TOWANDA, McLean, IL
Built 1973 Load: 44.1 t ADT: 11,900
COLLEGE AVE FAU 63
FairOver: PHEASANT CREEK
1.5 NNW 51 & 150, McLean, IL
Built 1981 Load: 44.1 t ADT: 12,900
I-74
FairOver: CREEK
2 M SE OF FAS1478, McLean, IL
Built 1969 Load: 44.4 t ADT: 21,500
GREGORY STREET
FairOver: SUGAR CR MAIN BRANCH
1.9 MI N 51 & 150, McLean, IL
Built 1970 Load: 44.4 t ADT: 6,350
US 136
FairOver: DITCH
4.3 M E US 136 & 150, McLean, IL
Built 1933 Load: 45.0 t ADT: 1,000
I-55 NB
FairOver: FAP 704
JCT. FAI55 & VET PKW, McLean, IL
Built 2004 Load: 45.7 t ADT: 12,400
I-55 NBL
FairOver: EB I-74/SW BLOOM.
JCT I-55 & I-74, McLean, IL
Built 2010 Load: 46.0 t ADT: 10,650
CH 34 (FAU 6381)
FairOver: ICG RAILROAD
SHIRLEY IL, McLean, IL
Built 1977 Load: 46.3 t ADT: 750
I-74 EB
FairOver: KICKAPOO CR
5.93 MI E OF US 51, McLean, IL
Built 1968 Load: 46.7 t ADT: 9,500
I-55 BUSN LOOP NB
FairOver: I-74/SW BLOOMINGTON
55 BUSN LP OV I-74, McLean, IL
Built 2013 Load: 47.0 t ADT: 6,950
I-55 SB
FairOver: MACKINAW RIVER
2 MI SW OF LEXINGTON, McLean, IL
Built 1973 Load: 47.6 t ADT: 11,900
I-55 NB
FairOver: MACKINAW RIVER
2 MI SW OF LEXINGTON, McLean, IL
Built 1973 Load: 47.6 t ADT: 11,900
I-74 EB
FairOver: LITTLE KICKAPOO CR
7.6 MI E OF US 51, McLean, IL
Built 1968 Load: 48.0 t ADT: 10,800
US 51 NB
FairOver: Norfolk Southern Railway
US 51 NB BLOOMINGTON, McLean, IL
Built 1981 Load: 48.3 t ADT: 8,700
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.