US Bridges

N Elizabeth Route over Branch of Plum R

Good

Carroll County, Illinois · 6 MI NW Mt.Carroll · Structure no. 008310300000000

Built
1965
60 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete
Length
36 ft
2 main spans
Daily traffic
275
2021 count
Owner
County
County Highway Agency

About this bridge

N Elizabeth Route over Branch of Plum R is a concrete culvert carrying N Elizabeth Route over Branch of Plum R in Carroll County, Illinois. It was built in 1965, so it is 60 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 275 vehicles a day, roughly 25% of them trucks, projected to reach 278 by 2046. The structure is 36 ft (11.1 m) long. If it were closed, the detour would be 29.8 mi (48 km).

CarriesN Elizabeth Route
CrossesBranch of Plum R
Location6 MI NW Mt.Carroll
RouteCounty Highway 0
Coordinates42.16164, -90.05704
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length36 ft (11.1 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2021)
Projected traffic278 by 2046
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 N Elizabeth Route over Branch of Plum R built?

It was built in 1965, making it 60 years old in 2025.

What condition is N Elizabeth Route over Branch of Plum R in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does N Elizabeth Route over Branch of Plum R carry?

About 275 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is N Elizabeth Route over Branch of Plum R?

The structure is 36 ft (11.1 m) long with a longest span of 18 ft (5.5 m).

Who owns N Elizabeth Route over Branch of Plum R?

It is owned by the County Highway Agency.