US Bridges

Gorman RD Ch 10 over Mazon River

Fair

Grundy County, Illinois · 0.04 MI N TR 109B · Structure no. 032323500000000

Built
1987
38 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
223 ft
3 main spans
Daily traffic
175
2024 count
Owner
County
County Highway Agency

About this bridge

Gorman RD Ch 10 over Mazon River is a steel continuous stringer/multi-beam or girder carrying Gorman RD Ch 10 over Mazon River in Grundy County, Illinois. It was built in 1987, so it is 38 years old, younger 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 5 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 175 vehicles a day, roughly 25% of them trucks, projected to reach 360 by 2046. The structure is 223 ft (68 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesGorman RD Ch 10
CrossesMazon River
Location0.04 MI N TR 109B
RouteCounty Highway 0
CountyGrundy County
StateIllinois
Coordinates41.2428, -88.34186
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length223 ft (68 m)
Longest span84 ft (25.6 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2024)
Projected traffic360 by 2046
Trucks25%
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

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 Gorman RD Ch 10 over Mazon River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Gorman RD Ch 10 over Mazon River 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 October 2024.

How much traffic does Gorman RD Ch 10 over Mazon River carry?

About 175 vehicles per day (2024 count), of which roughly 25% are trucks.

How long is Gorman RD Ch 10 over Mazon River?

The structure is 223 ft (68 m) long with a longest span of 84 ft (25.6 m) and a deck 27 ft wide.

Who owns Gorman RD Ch 10 over Mazon River?

It is owned by the County Highway Agency.