Total bridges
371
Public highway bridges in Lee County
County profile · official public datasets
Lee County, IL
371 public highway bridges tracked in the FHWA National Bridge Inventory: 39.9% rated Good, 48% Fair, 12.1% Poor.
- 371
- Public bridges
- 39.9%
- Good condition
- 12.1%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Lee County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 83rd
- of 102 on Poor share
- 12.1%
- Poor-condition share
- 371
- public highway bridges
- 1980
- 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.
Lee County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Lee County ranks #83 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 12.1%). Lee County, Illinois contains 371 public highway bridges. Roughly 39.9% are rated “Good,” 48% “Fair,” and 12.1% “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
39.9%
148 of 371 rated 7-9
Fair condition
48%
178 of 371 rated 5-6
Poor condition
12.1%
45 of 371 rated 4 or below
In-state Poor-share rank
#83 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 371 NBI-tracked bridges by lowest applicable component rating.
Good 39.9% (148)
Fair 48% (178)
Poor 12.1% (45)
Lee County's Poor-condition bridges carry 9,240 vehicle crossings a day
That is 1.4% of the county's reported daily bridge traffic on 11.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 210 crossings a day against 1,179 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 370 of 371 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
39.9% of Lee County's bridges have passed the 50-year mark
148 of the 371 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 39.9% 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 20.6% of the county's Poor-condition bridge traffic
CH 1 LOST NATION R over FRANKLIN CREEK, built 1957, carries 1,900 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 45-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 9,240 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Lee County's bridges were built
371 bridges with a recorded construction year, grouped by decade
- 1900s 4
1900–1909
4 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 8
1930–1939
8 bridges
- 1940s 2
1940–1949
2 bridges
- 1950s 30
1950–1959
30 bridges
- 1960s
1960–1969
49 bridges
- 1970s
1970–1979
65 bridges
- 1980s
1980–1989
97 bridges
- 1990s
1990–1999
54 bridges
- 2000s 35
2000–2009
35 bridges
- 2010s 23
2010–2019
23 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1980s, when 97 of the county's bridges still in the inventory were built, which is 26.1% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1980) matches the Illinois average (1979).
How Lee County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest Lee County in number of bridges, with their condition splits. Its 12.1% Poor share is the 3rd-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1979 is in line with the group.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Ogle County | 377 | 46.2% | 46.2% | 7.7% | 1981 |
| Bureau County | 375 | 41.3% | 43.5% | 15.2% | 1978 |
| Lee County (this page) | 371 | 39.9% | 48% | 12.1% | 1980 |
| Tazewell County | 358 | 25.4% | 60.1% | 14.5% | 1976 |
| Fayette County | 357 | 56.6% | 38.4% | 5% | 1976 |
| Peoria County | 352 | 24.1% | 57.7% | 18.2% | 1983 |
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 Lee 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 Lee County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (371 bridges here).
- Genesee County, MI · 371 bridges
- Carroll County, MO · 371 bridges
- Fayette County, TX · 371 bridges
- Clinton County, IA · 372 bridges
Similar average build year
Nearest mean year-built outside IL (1980 here).
- Tulsa County, OK · avg 1980 · 1,135 bridges
- Miami-Dade County, FL · avg 1980 · 1,057 bridges
- Pulaski County, AR · avg 1980 · 721 bridges
- McLennan County, TX · avg 1980 · 714 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (371)
ATKINSON RD
FairOver: GREEN RIVER
4.6 MI N BUREAU CO L, Lee, IL
Built 1967 Load: 9.4 t ADT: 100
COTTAGE HILL ROAD
FairOver: UNNAMED CREEK
0.3 M W ANGLING RD, Lee, IL
Built 1963 Load: 16.8 t ADT: 75
TR-32 (HARMON RD)
FairOver: RED OAK DITCH
0.2 M N BUREAU CO LN, Lee, IL
Built 1968 Load: 18.1 t ADT: 150
RED BRICK RD
FairOver: THREE MILE BRANCH
0.5 MI S OF US 52, Lee, IL
Built 1961 Load: 18.8 t ADT: 225
HARMON RD
FairOver: GREEN RIVER
6 MI S HARMON, Lee, IL
Built 1946 Load: 19.1 t ADT: 150
CH 16 ROCK ISLAND
FairOver: UP RR
0.5 MI SW DIXON, Lee, IL
Built 1955 Load: 20.4 t ADT: 2,150
CH 22 ELDENA RD
FairOver: 3 MILE BRANCH TRIBUT
1.8 MI S US 52, Lee, IL
Built 1964 Load: 20.4 t ADT: 300
SUGAR GROVE ROAD
FairOver: SUGAR CREEK
1.3 M NW PALMYRA RD, Lee, IL
Built 1962 Load: 20.7 t ADT: 175
CENTER ROAD
FairOver: BR OF BUREAU CREEK
3.1 M S OF SUBLETTE, Lee, IL
Built 1961 Load: 21.1 t ADT: 25
MCGIRR RD
FairOver: FRANKLIN CREEK
0.8 MI E WHITNEY RD, Lee, IL
Built 1969 Load: 21.7 t ADT: 25
CH 5 INLET RD
FairOver: BRANCH OF GREEN RIVE
2 MI N SHAW RD, Lee, IL
Built 1961 Load: 22.0 t ADT: 400
INDIAN HEAD ROAD
FairOver: BR OF GREEN RIVER
0.6 M N TAMPICO ROAD, Lee, IL
Built 1968 Load: 22.4 t ADT: 250
CH 8 STEWARD RD
FairOver: WILLOW CREEK
5.5 MI S STEWARD, Lee, IL
Built 1951 Load: 22.7 t ADT: 125
CH 19 MORGAN RD
FairOver: BRANCH OF GREEN RIVE
2 MI N OF MAYTOWN RD, Lee, IL
Built 1960 Load: 24.0 t ADT: 200
CH 8 STEWARD RD
FairOver: BRANCH OF STEWARD CR
3.0 MI N STEWARD, Lee, IL
Built 1962 Load: 24.3 t ADT: 600
ST MARYS ROAD
FairOver: STREAM
7.5 MI S OF AMBOY, Lee, IL
Built 1971 Load: 24.3 t ADT: 25
NACHUSA RD
FairOver: CHAMBERLAN CREEK
1.2 MI N OF ILL 38, Lee, IL
Built 1971 Load: 24.3 t ADT: 75
KILGORE ROAD
FairOver: KEMPERS CREEK
3 MI W OF DIXON, Lee, IL
Built 1927 Load: 24.3 t ADT: 325
INLET ROAD
FairOver: BR OF GREEN RIVER
0.4 M N OF US RT 52, Lee, IL
Built 1961 Load: 24.3 t ADT: 550
CH 20 LAMOILLE RD
FairOver: DRAINAGE DITCH
1.7 MI N BUREAU CO L, Lee, IL
Built 1931 Load: 24.3 t ADT: 600
BROOKLYN RD
FairOver: DRAINAGE DITCH
4.2 M N OF US 30, Lee, IL
Built 1962 Load: 24.3 t ADT: 250
NAUMAN RD
FairOver: TRIB GREEN RIVER
0.3 E OF US 52, Lee, IL
Built 1969 Load: 24.3 t ADT: 25
HILLISON ROAD
FairOver: UNNAMED CREEK
0.1 M W FRANKLIN RD, Lee, IL
Built 1966 Load: 24.3 t ADT: 25
RED BRICK RD
FairOver: 5-MILE BRANCH
0.5 MI N OF US 30, Lee, IL
Built 1959 Load: 24.3 t ADT: 325
RANDALL RD
FairOver: DRAINAGE DITCH
0.2 MI S US 30, Lee, IL
Built 1959 Load: 24.6 t ADT: 25
WOODLAWN RD
FairOver: STEWARD CR
1.5 MI S OF PERRY RD, Lee, IL
Built 1955 Load: 25.3 t ADT: 125
ATKINSON RD
FairOver: BASS DITCH
1.6 M N BUREAU CO L, Lee, IL
Built 1954 Load: 25.6 t ADT: 50
CH 8 STEWARD RD
FairOver: GREEN RV DRAINAGE DI
3.0 MI S OF STEWARD, Lee, IL
Built 1964 Load: 25.9 t ADT: 150
WHITE OAKS LANE
FairOver: HAUL RD CEMENT PLNT
2.25MI N. OF IL 2, Lee, IL
Built 2002 Load: 25.9 t ADT: 800
THORPE RD
FairOver: TRIB BEECH CR
0.3 MI S OGLE CO L, Lee, IL
Built 1901 Load: 25.9 t ADT: 50
I-88 WB
FairOver: US 52
SE EDGE OF DIXON, Lee, IL
Built 1974 Load: 25.9 t ADT: 8,050
I-88 EB
FairOver: US 52
SE EDGE OF DIXON, Lee, IL
Built 1974 Load: 25.9 t ADT: 8,050
CH11 PUMP FACTORY
FairOver: FIVE MILE BRANCH
0.5 MI N OF US 30, Lee, IL
Built 1964 Load: 26.2 t ADT: 200
BROOKLYN RD
FairOver: BEACH CREEK
1.2 MI S OGLE CO L, Lee, IL
Built 1961 Load: 26.2 t ADT: 200
MELUGINS GROVE ROA
FairOver: BR OF GREEN RIVER
1.5 M S OF US RT 30, Lee, IL
Built 1962 Load: 26.2 t ADT: 25
CH 12 ATKINSON RD
FairOver: GREEN RV DRAINAGE DI
2.6 N OF BUREAU CO, Lee, IL
Built 1960 Load: 26.9 t ADT: 10
CH 1 LOST NATION R
FairOver: CHAMBERLAIN CREEK
1.7 MI S OF OGLE CO, Lee, IL
Built 1963 Load: 26.9 t ADT: 1,900
CH 19 MORGAN RD
FairOver: GREEN RIVER
1.6 MI S AMBOY RD, Lee, IL
Built 1958 Load: 27.9 t ADT: 275
CH11 PUMP FACTORY
FairOver: FIVE MILE BRANCH TRI
1.8 MI S OF US 30, Lee, IL
Built 1959 Load: 27.9 t ADT: 125
CH 1 LOST NATION R
FairOver: ROCK RIVER TRIBUTARY
0.7 MI E ILL RT 2, Lee, IL
Built 1963 Load: 28.2 t ADT: 1,900
CH 14 AMBOY RD
FairOver: MAIN DITCH CH 14 AMB
1.0 MI E OF ILL 26, Lee, IL
Built 1946 Load: 28.5 t ADT: 550
US ROUTE 30
FairOver: GREEN RIVER
6.2 MI E JCT US 52, Lee, IL
Built 1937 Load: 28.8 t ADT: 1,950
CH 33 ROCKY FORD R
FairOver: GREEN RIVER TRIBUTRY
2 MI S OF AMBOY, Lee, IL
Built 1958 Load: 28.8 t ADT: 225
FRANKLIN RD
FairOver: I-88
1 MI SW FRANKLIN GRV, Lee, IL
Built 1974 Load: 28.8 t ADT: 550
CH 15 HARMON RD
FairOver: HOWLAND CREEK
0.3 MI S OF US 30, Lee, IL
Built 1956 Load: 29.2 t ADT: 450
CHURCH RD
FairOver: BUREAU CR
2.1 MI N LASALLE CO, Lee, IL
Built 1955 Load: 29.5 t ADT: 100
NAYLOR RD
FairOver: FRANKLIN CREEK
3.2 MI E OF ILL 2, Lee, IL
Built 1955 Load: 29.5 t ADT: 275
CH 6 BROOKLYN RD
FairOver: GREEN RV DRAINAGE DI
2.5 MI N US 30, Lee, IL
Built 1958 Load: 29.8 t ADT: 250
CONRAD RD
FairOver: STEWARD CREEK
1.2 MI W OF IL 251, Lee, IL
Built 1970 Load: 29.8 t ADT: 50
FRANKLIN ROAD
FairOver: UNNAMED STREAM
1.1 M N OF US RT 52, Lee, IL
Built 1963 Load: 29.8 t ADT: 550
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.