CH 12
Carrying CH 12 over DRAINAGE CANAL
0.1 M W VALMEYER C L, Monroe, Illinois
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: CH 12
The CH 12 bridge in Monroe, Illinois carries CH 12 over DRAINAGE CANAL. It was built in 1935, making it 91 years old today. It was last reconstructed in 1990, extending its service life. The structure is built primarily of steel and spans 3 sections, stretching 28.7 meters (94 feet) end to end. Daily traffic averages 400 vehicles, placing it in the lower-traffic tier of Illinois bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 3/9, substructure at 6/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How CH 12 compares
Live comparison across Illinois.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1935
- Last Reconstructed
- 1990
- Material
- Steel
- Number of Spans
- 3
- Structure Length
- 28.7 m (94 ft)
- Deck Width
- 10.7 m (35 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 400 vehicles/day
- Structure Number
- 067001300000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) is in poor condition (3/9), showing advanced deterioration that may require priority repair.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
How to read this record
CH 12 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare CH 12 against other structures in Monroe and across Illinois. Illinois bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for CH 12?
CH 12 in Monroe, Illinois has a deck rating of 7/9, superstructure rating of 3/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is CH 12 inspected?
CH 12's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 400 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. CH 12 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for CH 12?
An inventory load rating is not recorded for CH 12.
Who is responsible for maintaining CH 12?
CH 12 is owned and maintained by County Highway Agency.
How old is CH 12 and does age affect safety?
CH 12 was built in 1935, making it 91 years old and last reconstructed in 1990.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
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.