US Bridges

Bootjack RD S641 over Trap Rock River

Fair

Houghton County, Michigan · .5 MI E of Lake Linden · Structure no. 000000000003420

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
1,937
1993 count
Owner
County
County Highway Agency

About this bridge

Bootjack RD S641 over Trap Rock River is a prestressed concrete stringer/multi-beam or girder carrying Bootjack RD S641 over Trap Rock River in Houghton County, Michigan. It was built in 1975, so it is 50 years old, older 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 1,937 vehicles a day, projected to reach 1,937 by 2013. The structure is 54 ft (16.4 m) long and 42 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesBootjack RD S641
CrossesTrap Rock River
Location.5 MI E of Lake Linden
RouteCounty Highway 3180
CountyHoughton County
StateMichigan
Coordinates47.19596, -88.39634
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating76.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length54 ft (16.4 m)
Longest span50 ft (15.2 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,937 (1993)
Projected traffic1,937 by 2013
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Bootjack RD S641 over Trap Rock River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Bootjack RD S641 over Trap Rock 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 2023.

How much traffic does Bootjack RD S641 over Trap Rock River carry?

About 1,937 vehicles per day (1993 count).

How long is Bootjack RD S641 over Trap Rock River?

The structure is 54 ft (16.4 m) long with a longest span of 50 ft (15.2 m) and a deck 42 ft wide.

Who owns Bootjack RD S641 over Trap Rock River?

It is owned by the County Highway Agency.