US Bridges

Reed Road TR-107B over Mazon River

Fair

Grundy County, Illinois · .33 MI W Gorman RD · Structure no. 032511100000000

Built
1981
44 years old
Condition
Fair
inspected October 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
257 ft
3 main spans
Daily traffic
225
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Reed Road TR-107B over Mazon River is a steel continuous stringer/multi-beam or girder carrying Reed Road TR-107B over Mazon River in Grundy County, Illinois. It was built in 1981, so it is 44 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 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 225 vehicles a day, roughly 20% of them trucks, projected to reach 330 by 2046. The structure is 257 ft (78.3 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesReed Road TR-107B
CrossesMazon River
Location.33 MI W Gorman RD
RouteCounty Highway 0
CountyGrundy County
StateIllinois
Coordinates41.25758, -88.34858
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
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 rating79.7 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length257 ft (78.3 m)
Longest span98 ft (29.9 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2024)
Projected traffic330 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Reed Road TR-107B over Mazon River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Reed Road TR-107B 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 2022.

How much traffic does Reed Road TR-107B over Mazon River carry?

About 225 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Reed Road TR-107B over Mazon River?

The structure is 257 ft (78.3 m) long with a longest span of 98 ft (29.9 m) and a deck 27 ft wide.

Who owns Reed Road TR-107B over Mazon River?

It is owned by the Town or Township Highway Agency.