US Bridges

Ch 29 over Cahaoka Creek

Poor

Macoupin County, Illinois · 6.5 N Mt Olive · Structure no. 059502600000000

Built
1975
50 years old
Condition
Poor
inspected January 2023
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
350
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Ch 29 over Cahaoka Creek is a steel culvert carrying Ch 29 over Cahaoka Creek in Macoupin County, Illinois. It was built in 1975, so it is 50 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 350 vehicles a day, roughly 17% of them trucks, projected to reach 354 by 2046. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCh 29
CrossesCahaoka Creek
Location6.5 N Mt Olive
RouteCounty Highway 0
CountyMacoupin County
StateIllinois
Coordinates39.16601, -89.71859
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.9 US tons
Inventory rating97.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2021)
Projected traffic354 by 2046
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Ch 29 over Cahaoka Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Ch 29 over Cahaoka 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 January 2023.

How much traffic does Ch 29 over Cahaoka Creek carry?

About 350 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is Ch 29 over Cahaoka Creek?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m).

Who owns Ch 29 over Cahaoka Creek?

It is owned by the Town or Township Highway Agency.