US Bridges

Ch 15 Harmon RD over Howland Creek

Fair

Lee County, Illinois · 0.3 MI S of US 30 · Structure no. 052332200000000

Built
1956
69 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
450
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 15 Harmon RD over Howland Creek is a concrete slab carrying Ch 15 Harmon RD over Howland Creek in Lee County, Illinois. It was built in 1956, so it is 69 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 450 vehicles a day, roughly 10% of them trucks, projected to reach 657 by 2046. The structure is 26 ft (7.8 m) long and 28 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCh 15 Harmon RD
CrossesHowland Creek
Location0.3 MI S of US 30
RouteCounty Highway 0
CountyLee County
StateIllinois
Coordinates41.75345, -89.55423
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.9 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length26 ft (7.8 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2022)
Projected traffic657 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$53,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ch 15 Harmon RD over Howland Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Ch 15 Harmon RD over Howland Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2025.

How much traffic does Ch 15 Harmon RD over Howland Creek carry?

About 450 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Ch 15 Harmon RD over Howland Creek?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns Ch 15 Harmon RD over Howland Creek?

It is owned by the County Highway Agency.