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.
Condition Distribution
All Bridges (111)
US 20 EB
UnknownOver: I-90
.11 MI E WHEELER RD, Boone, IL
US 20 EB
UnknownOver: S APPLETON RD
SW EDGE BELVIDERE, Boone, IL
US 20 WB
UnknownOver: S APPLETON RD
SW EDGE BELVIDERE, Boone, IL
UP RR
UnknownOver: US 20 BR
E EDGE OF BELVIDERE, Boone, IL
POPLAR GROVE RD
UnknownOver: US 20 BR
NE OF BELVIDERE, Boone, IL
US 20 WB
UnknownOver: I-90
.13 MI E WHEELER RD, Boone, IL
UP RR
UnknownOver: I-90
1 MI E WINN CO, Boone, IL
GENOA RD- FAS 37
UnknownOver: I 90
.6 MI S OF US 20, Boone, IL
JOHNSON RD
UnknownOver: I 90
.5 MI S CHRYSLER DR, Boone, IL
SHATTUCK RD
UnknownOver: I 90
2.5 MI W MCHENRY CO, Boone, IL
COUNTY LINE RD
UnknownOver: I 90
MC HENRY CO LINE, Boone, IL
IRENE RD
UnknownOver: I 90
.5 MI S US 20, Boone, IL
STONE QUARRY RD
UnknownOver: I 90
.5 MI S US 20, Boone, IL
TOWNHALL RD
UnknownOver: I 90
2 MI E OF US 20, Boone, IL
PEARL ST
UnknownOver: I 90
4 MI E OF US 20, Boone, IL
SPRING CENTER RD
UnknownOver: I 90
3 MI W MCHENRY CO, Boone, IL
TRIPP RD
UnknownOver: I-90
.5 MI S OF US 20, Boone, IL
Garden Prairie Roa
UnknownOver: I-90
1 Mi W. of Co. Line, Boone, IL
Belvidere Oasis
UnknownOver: I-90
4.4 Mi E of US20, Boone, IL
SQUAW PRAIRIE RD
FairOver: BEAVER CREEK
2.5 MI NW BELVIDERE, Boone, IL
WOODSTOCK RD
FairOver: PISCASAW CREEK
.6 MI E POPLAR GR RD, Boone, IL
RUSSELLVILLE RD
FairOver: PISCASAW BRANCH
5.0 MI SE POPLAR GR, Boone, IL
MARENGO RD
FairOver: PISCASAW CREEK
1.5 MI NE BELVIDERE, Boone, IL
DAWSON LAKE RD
FairOver: BRANCH OF BEAVER CR
5.0 MI N BELVIDERE, Boone, IL
BERGEN RD
FairOver: N KINNIKINNICK CREEK
7.5 MI NW POPLAR GRV, Boone, IL
N BOONE SCHOOL RD
FairOver: S. KINNIKINNICK CRK.
3.0 MI N CALEDONIA, Boone, IL
SHATTUCK RD
FairOver: MOSQUITO CREEK
3.0 MI E BELVIDERE, Boone, IL
GUSTAFSON RD
FairOver: BEAVER CREEK
3.5 MI NW BELVIDERE, Boone, IL
S. APPLETON ROAD
FairOver: KISHWAUKEE RIVER
S OF LINCOLN AVE, Boone, IL
ILL ROUTE 173
FairOver: BEAVER CR TRIBUTARY
1.5 MI W CAPRON, Boone, IL
IL 76
FairOver: DRAINAGE DITCH
0.8 MI. N.OF BUS 20, Boone, IL
NEWBURG RD
FairOver: KISHWAUKEE RIVER
3.5 MI W OF BELVIDER, Boone, IL
MCCURRY RD
FairOver: N KINNIKINNICK CREEK
5.5 MI NE ROSCOE, Boone, IL
N BOONE SCHOOL RD
FairOver: BEAVER CREEK
2.5 MI NW CAPRON, Boone, IL
RUSSELLVILLE ROAD
FairOver: PISCASAW CREEK
1.5 M SE POPLAR GROV, Boone, IL
CAPRON RD
FairOver: BR PISCASAW CREEK
3.5 MI S CAPRON, Boone, IL
BEAVERTON ROAD
FairOver: BEAVER CREEK
1.0 M E POPLAR GROVE, Boone, IL
EPWORTH RD
FairOver: KISHWAUKEERIVER
3.MI E OF BELVIDERE, Boone, IL
RIVERSIDE ROAD
FairOver: BEAVER CREEK
4.0 MI NW BELVIDERE, Boone, IL
SPRING CREEK RD
FairOver: BEAVER CREEK
4 MI NW OF BELVIDERE, Boone, IL
WHEELER RD
FairOver: CN RR
2 MI N DEKALB CO LN, Boone, IL
IL 173
FairOver: BEAVER CREEK
0.5 MI. SW. CAPRON, Boone, IL
US 20
FairOver: COON CREEK
2 MI. E. BELVIDERE, Boone, IL
HUBER ROAD
FairOver: MOSQUITO CREEK
3.5 MI SE BELVIDERE, Boone, IL
IL 173
FairOver: BEAVER CREEK
2.0 MI E POPLAR GROV, Boone, IL
SQUAW PRAIRIE RD
FairOver: PISCASAW CREEK
2.0 MI NE BELVIDERE, Boone, IL
US 20 BR
FairOver: BEAVER CREEK
2.5 MI W BELVIDERE, Boone, IL
US 20 BR
FairOver: TRIB. OF BEAVER CR.
.1 MI E. WINN. CO LN, Boone, IL
MAIN ST
FairOver: KISHWAUKEE RIVER
S OF LINCOLN AVE, Boone, IL
US BR 20
FairOver: KISHWAUKEE RIVER
E EDGE OF BELVIDERE, Boone, IL
Read our methodology - how this data is sourced, computed, and verified.
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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.