US Bridges

County Line RD over Mud Creek

Poor

Boone County, Illinois · 8.0 MI NE Belvidere · Structure no. 004301800000000

Built
1959
66 years old
Condition
Poor
inspected March 2024
Type
Culvert
Steel
Length
25 ft
3 main spans
Daily traffic
675
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Line RD over Mud Creek is a steel culvert carrying County Line RD over Mud Creek in Boone County, Illinois. It was built in 1959, so it is 66 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 675 vehicles a day, roughly 7% of them trucks, projected to reach 702 by 2046. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty Line RD
CrossesMud Creek
Location8.0 MI NE Belvidere
RouteCounty Highway 0
CountyBoone County
StateIllinois
Coordinates42.2939, -88.70563
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating80.4 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 15
Structure length25 ft (7.6 m)
Longest span7 ft (2.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic675 (2021)
Projected traffic702 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Line RD over Mud Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is County Line RD over Mud Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does County Line RD over Mud Creek carry?

About 675 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is County Line RD over Mud Creek?

The structure is 25 ft (7.6 m) long with a longest span of 7 ft (2.2 m).

Who owns County Line RD over Mud Creek?

It is owned by the Town or Township Highway Agency.