US Bridges

Big Traverse Road over Slough Outlet to Lake Su

Fair

Houghton County, Michigan · 2 MI S 8 MI E Lake Linden · Structure no. 000000000003438

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
100
1993 count
Owner
County
County Highway Agency

About this bridge

Big Traverse Road over Slough Outlet to Lake Su is a concrete culvert carrying Big Traverse Road over Slough Outlet to Lake Su in Houghton County, Michigan. It was built in 1987, so it is 38 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 100 vehicles a day, projected to reach 100 by 2013. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesBig Traverse Road
CrossesSlough Outlet to Lake Su
Location2 MI S 8 MI E Lake Linden
RouteCounty Highway 0
CountyHoughton County
StateMichigan
Coordinates47.15084, -88.26942
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1993)
Projected traffic100 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 Big Traverse Road over Slough Outlet to Lake Su built?

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

What condition is Big Traverse Road over Slough Outlet to Lake Su 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 Big Traverse Road over Slough Outlet to Lake Su carry?

About 100 vehicles per day (1993 count).

How long is Big Traverse Road over Slough Outlet to Lake Su?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m).

Who owns Big Traverse Road over Slough Outlet to Lake Su?

It is owned by the County Highway Agency.