US Bridges

Tilson Road over Waiska River

Fair

Chippewa County, Michigan · 9 MI N of Rudyard · Structure no. 000000000001622

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
125
1986 count
Owner
County
County Highway Agency

About this bridge

Tilson Road over Waiska River is a prestressed concrete stringer/multi-beam or girder carrying Tilson Road over Waiska River in Chippewa County, Michigan. It was built in 1979, so it is 46 years old, younger than the Michigan average of 48.3 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 125 vehicles a day, projected to reach 220 by 2019. The structure is 73 ft (22.2 m) long and 34 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesTilson Road
CrossesWaiska River
Location9 MI N of Rudyard
RouteCounty Highway 1733
CountyChippewa County
StateMichigan
Coordinates46.36299, -84.5931
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.8 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length73 ft (22.2 m)
Longest span71 ft (21.6 m)
Deck width34 ft (10.3 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (1986)
Projected traffic220 by 2019
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 Tilson Road over Waiska River built?

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

What condition is Tilson Road over Waiska 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 June 2023.

How much traffic does Tilson Road over Waiska River carry?

About 125 vehicles per day (1986 count).

How long is Tilson Road over Waiska River?

The structure is 73 ft (22.2 m) long with a longest span of 71 ft (21.6 m) and a deck 34 ft wide.

Who owns Tilson Road over Waiska River?

It is owned by the County Highway Agency.