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)
I 90
GoodOver: STREAM
0.6 MI E STONE QUARY, Boone, IL
COUNTY LINE RD
GoodOver: BR PISCASAW CREEK
1.5 E CAPRON, Boone, IL
BLAINE RD
GoodOver: BRANCH BEAVER CREEK
3.0 MI N CAPRON, Boone, IL
I-90
GoodOver: STREAM
1.9 MI E WINN CO LN, Boone, IL
CAPRON RD
PoorOver: PISCASAW CREEK
2.5 MI S CAPRON, Boone, IL
STONE QUARRY RD
PoorOver: HACKEY CREEK
0.5 S BELVIDERE, Boone, IL
EDSON ROAD
PoorOver: BEAVER CR
0.5 MI SE POPLAR GRO, Boone, IL
DENNY ROAD
PoorOver: PISCASAW CREEK
2.5 SE POPLAR GROVE, Boone, IL
LAWRENCEVILLE ROAD
PoorOver: PISCASAW CREEK
0.5 MI E BELVIDERE L, Boone, IL
MILL RD
PoorOver: PISCASAW CREEK
1.5 MI S OF CAPRON, Boone, IL
S. APPLETON ROAD
PoorOver: KISHWAUKEE RIVER
N OF LOCUST ST, Boone, IL
Read our methodology - how this data is sourced, computed, and verified.
Related
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.