US Bridges

Twombly Rd. over Br.Killbuck Cr.

Good

Ogle County, Illinois · 1.0 N. Creston · Structure no. 071503600000000

Built
1950
75 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
75
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Twombly Rd. over Br.Killbuck Cr. is a concrete culvert carrying Twombly Rd. over Br.Killbuck Cr. in Ogle County, Illinois. It was built in 1950, so it is 75 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 16% of them trucks, projected to reach 156 by 2046. The structure is 24 ft (7.2 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesTwombly Rd.
CrossesBr.Killbuck Cr.
Location1.0 N. Creston
RouteCounty Highway 0
CountyOgle County
StateIllinois
Coordinates41.94972, -88.95898
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating25 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.2 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic156 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Twombly Rd. over Br.Killbuck Cr. built?

It was built in 1950, making it 75 years old in 2025.

What condition is Twombly Rd. over Br.Killbuck Cr. 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 July 2023.

How much traffic does Twombly Rd. over Br.Killbuck Cr. carry?

About 75 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Twombly Rd. over Br.Killbuck Cr.?

The structure is 24 ft (7.2 m) long with a longest span of 11 ft (3.4 m).

Who owns Twombly Rd. over Br.Killbuck Cr.?

It is owned by the Town or Township Highway Agency.