US Bridges

Grinter RD TR-129 over Brewster Run

Fair

Grundy County, Illinois · .26 MI E Old Maz RD · Structure no. 032504600000000

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Channel Beam
Concrete
Length
86 ft
3 main spans
Daily traffic
50
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Grinter RD TR-129 over Brewster Run is a concrete channel beam carrying Grinter RD TR-129 over Brewster Run in Grundy County, Illinois. It was built in 1979, so it is 46 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 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 50 vehicles a day, roughly 20% of them trucks, projected to reach 60 by 2046. The structure is 86 ft (26.2 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesGrinter RD TR-129
CrossesBrewster Run
Location.26 MI E Old Maz RD
RouteCounty Highway 0
CountyGrundy County
StateIllinois
Coordinates41.20544, -88.39331
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.
Substructure7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length86 ft (26.2 m)
Longest span28 ft (8.5 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic60 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Grinter RD TR-129 over Brewster Run built?

It was built in 1979, making it 46 years old in 2025.

What condition is Grinter RD TR-129 over Brewster Run 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 Grinter RD TR-129 over Brewster Run carry?

About 50 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Grinter RD TR-129 over Brewster Run?

The structure is 86 ft (26.2 m) long with a longest span of 28 ft (8.5 m) and a deck 26 ft wide.

Who owns Grinter RD TR-129 over Brewster Run?

It is owned by the Town or Township Highway Agency.