Boone County, IL

111 public highway bridges

Boone County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Boone County, Illinois contains 111 public highway bridges. Roughly 45% are rated “Good,” 31.5% “Fair,” and 6.3% “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.

111
Total Bridges
45%
Good
31.5%
Fair
6.3%
Poor Condition

Condition Distribution

Good
45% (50)
Fair
31.5% (35)
Poor
6.3% (7)

All Bridges (111)

IL 76

Fair

Over: BEAVER CREEK

2.5 MI. S. IL 173, Boone, IL

Built 1990 Load: 51.8 t ADT: 8,250

COUNTY LINE RD

Fair

Over: MUD CREEK

8.0 MI NE BELVIDERE, Boone, IL

Built 1959 Load: 72.9 t ADT: 675

HUNTER ROAD (FAS 3

Fair

Over: BR OF S KINNIKINNICK

0.2 MI E OF CO LINE, Boone, IL

Built 1975 Load: 80.0 t ADT: 2,150

LEROY CENTER RD

Fair

Over: BEAVER CREEK

3.0 MI NW CAPRON, Boone, IL

Built 1968 Load: 88.8 t ADT: 10

FREE CHURCH ROAD

Good

Over: N KINNIKINNICK CREEK

6.5 MI NE ROSCOE, Boone, IL

Built 1973 Load: 18.1 t ADT: 200

GARDEN PRAIRIE RD

Good

Over: SPRING CREEK

3.5 MI S GARDEN PRAI, Boone, IL

Built 1958 Load: 24.3 t ADT: 175

N BOONE SCHOOL RD

Good

Over: S. KINNIKINNICK CRK.

3.0 MI N CALEDONIA, Boone, IL

Built 1965 Load: 24.3 t ADT: 100

N BOONE SCHOOL RD

Good

Over: S. KINNIKINNICK CRK.

3.0 MI N CALEDONIA, Boone, IL

Built 1965 Load: 24.3 t ADT: 100

GRADE SCHOOL ROAD

Good

Over: N KINNIKINNICK CREEK

8.0 MI NW POPLAR GRO, Boone, IL

Built 1973 Load: 24.6 t ADT: 50

WHEELER RD

Good

Over: BRANCH OF KISHWAUKEE

1.5 MI SE CHERRY VAL, Boone, IL

Built 1959 Load: 25.9 t ADT: 1,450

STATE STREET

Good

Over: KISHWAUKEE RIVER

DOWNTOWN BELVIDERE, Boone, IL

Built 2001 Load: 32.4 t ADT: 8,800

ROCKTON RD

Good

Over: N KINNIKINNICK CREEK

6.5 MI NE ROSCOE, Boone, IL

Built 1973 Load: 32.4 t ADT: 250

CRAWFORD ROAD

Good

Over: SPRING CREEK

6.0 MI SE BELVIDERE, Boone, IL

Built 1977 Load: 32.4 t ADT: 250

BELOIT RD

Good

Over: BEAVER CREEK

3.5 MI NW BELVIDERE, Boone, IL

Built 1978 Load: 32.4 t ADT: 3,800

FRUIT FARM ROAD

Good

Over: MOSQUITO CREEK

3.5 MI SE BELVIDERE, Boone, IL

Built 1982 Load: 32.4 t ADT: 25

CARLSON RD

Good

Over: SPRING CREEK

3.0 MI S GARDEN PRAI, Boone, IL

Built 1984 Load: 32.4 t ADT: 325

REEDS CROSSING ROA

Good

Over: MOSQUITO CREEK

4.0 MI SE BELVIDERE, Boone, IL

Built 1983 Load: 32.4 t ADT: 200

GRANGE HALL RD

Good

Over: E BR PISCASAW CR

2.5 M SE POPLAR GROV, Boone, IL

Built 1986 Load: 32.4 t ADT: 50

BLOODS POINT ROAD

Good

Over: CN RR

1.5 MI E WINN CO LN, Boone, IL

Built 1991 Load: 32.4 t ADT: 550

CALEDONIA RD

Good

Over: BEAVER CREEK

2.5 M N. OF BELVIDER, Boone, IL

Built 2003 Load: 32.4 t ADT: 3,350

MARENGO RD (TR 77)

Good

Over: MUD CREEK

1.5 MI N GARDN PRARI, Boone, IL

Built 1994 Load: 32.4 t ADT: 2,000

LAWRENCEVILLE RD

Good

Over: MUD CREEK

1.5MI. NW GARDEN PR., Boone, IL

Built 2000 Load: 32.4 t ADT: 1,400

COUNTY LINE RD

Good

Over: BR PISCASAW CREEK

1.5 MI E OF CAPRON, Boone, IL

Built 2004 Load: 32.4 t ADT: 600

GARDEN PRAIRIE RD

Good

Over: COON CREEK

1.5 MI S GARDEN PR, Boone, IL

Built 2005 Load: 32.4 t ADT: 475

IRENE RD

Good

Over: UNNAMED CREEK

1.5MI S OF US 20, Boone, IL

Built 2007 Load: 32.4 t ADT: 1,650

RIVERSIDE ROAD

Good

Over: BR OF BEAVER CR

3.5MI NE OF BELVIDER, Boone, IL

Built 2007 Load: 32.4 t ADT: 2,350

COUNTY LINE RD

Good

Over: SPRING CREEK

2 MI SE GARDEN PRAIR, Boone, IL

Built 2016 Load: 32.4 t ADT: 100

CENTERVILLE RD

Good

Over: BEAVER CREEK

2 MI W OF CAPRON, Boone, IL

Built 2013 Load: 32.4 t ADT: 150

GARDEN PRAIRIE

Good

Over: KISHWAUKEE RIVER

.5 MI N US 20, Boone, IL

Built 2015 Load: 32.4 t ADT: 2,850

POPLAR GROVE RD

Good

Over: KISHWAUKEE RIVER

NE EDGE OF BELVIDERE, Boone, IL

Built 2020 Load: 32.4 t ADT: 2,200

LIVINGSTON SCHOOL

Good

Over: SOUTH KINNIKINNICK C

3.0 MI N CALEDONIA, Boone, IL

Built 2021 Load: 32.4 t ADT: 50

TOWNLINE RD

Good

Over: BR N KINNINNICK CR

NW CORNER BOONE CO., Boone, IL

Built 1960 Load: 32.4 t ADT: 100

CALEDONIA ROAD

Good

Over: S. KINNIKINNICK CR.

3.3 MI. N. CALEDONIA, Boone, IL

Built 1995 Load: 32.4 t ADT: 1,000

POPLAR GROVE RD

Good

Over: BR. OF BEAVER CREEK

1.75 MI. N. OF IL173, Boone, IL

Built 1998 Load: 32.4 t ADT: 1,350

PEARL STREET RD

Good

Over: KINGSBURY CREEK

AT DEKALB CO. LINE, Boone, IL

Built 1999 Load: 32.4 t ADT: 500

IRENE RD

Good

Over: UNNAMED CRK

0.25 MI S OF US 20, Boone, IL

Built 1900 Load: 32.4 t ADT: 3,200

ORTH ROAD

Good

Over: BR OF BEAVER CREEK

0.6 MI. W. OF IL 76, Boone, IL

Built 2009 Load: 32.4 t ADT: 1,650

TOWN HALL ROAD

Good

Over: UNNAMED STREAM

0.25MI S OF US 20, Boone, IL

Built 2010 Load: 32.4 t ADT: 4,950

FAS-39 (HUNTER RD)

Good

Over: BEAVER CREEK

3.0 MI NW OF CAPRON, Boone, IL

Built 2011 Load: 34.0 t ADT: 1,550

IL 173

Good

Over: BR. BEAVER CREEK

2.7 MI. E. OF IL 76, Boone, IL

Built 2000 Load: 35.0 t ADT: 4,100

IL 173

Good

Over: WILLOW CREEK

0.3 MI E WINN. CO LN, Boone, IL

Built 1994 Load: 42.1 t ADT: 6,250

DENNY RD

Good

Over: GERYLINE CR

3.5 MI SE POPLAR GROVE, Boone, IL

Built 2021 Load: 42.8 t ADT: 300

IL 173

Good

Over: PISCASAW CREEKTRIB.

AT MCHENRY CO. LN., Boone, IL

Built 2001 Load: 45.4 t ADT: 5,000

I 90 WB

Good

Over: MOSQUITO CRK

3 MI SE OF BELVIDERE, Boone, IL

Built 2013 Load: 46.7 t ADT: 27,150

I 90 EB

Good

Over: MOSQUITO CKR

3 MI SE OF BELVIDERE, Boone, IL

Built 2013 Load: 48.9 t ADT: 27,150

BLAINE RD

Good

Over: BEAVER CREEK

3.0 MI NW CAPRON, Boone, IL

Built 2018 Load: 49.6 t ADT: 50

I-90

Good

Over: STREAM

3.8 MI E WINN CO LN, Boone, IL

Built 1958 Load: 50.5 t ADT: 24,800

POPLAR GROVE CREEK

Good

Over: BEAVER CREEK

1.0 MI S POPLAR GR, Boone, IL

Built 2023 Load: 58.3 t ADT: 2,550

I-90

Good

Over: STREAM

0.7 MI W MCHENRY CO, Boone, IL

Built 1958 Load: 67.4 t ADT: 27,150

IL RTE 173

Good

Over: CREEK

.23MI E OF IL 76, Boone, IL

Built 2015 Load: 73.2 t ADT: 4,850

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

Related

Browse all → | Rankings →
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge 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.