US Bridges

Kk Road over Salmon - Trout River

Poor

Marquette County, Michigan · 3.5 MI NW of Big Bay · Structure no. 000000000013085

Built
1947
78 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
137
2019 count
Owner
County
County Highway Agency

About this bridge

Kk Road over Salmon - Trout River is a steel stringer/multi-beam or girder carrying Kk Road over Salmon - Trout River in Marquette County, Michigan. It was built in 1947, so it is 78 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 137 vehicles a day, roughly 30% of them trucks, projected to reach 200 by 2039. The structure is 53 ft (16.1 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesKk Road
CrossesSalmon - Trout River
Location3.5 MI NW of Big Bay
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.84849, -87.79872
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length53 ft (16.1 m)
Longest span43 ft (13.1 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic137 (2019)
Projected traffic200 by 2039
Trucks30%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$20,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Kk Road over Salmon - Trout River built?

It was built in 1947, making it 78 years old in 2025.

What condition is Kk Road over Salmon - Trout River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Kk Road over Salmon - Trout River carry?

About 137 vehicles per day (2019 count), of which roughly 30% are trucks.

How long is Kk Road over Salmon - Trout River?

The structure is 53 ft (16.1 m) long with a longest span of 43 ft (13.1 m) and a deck 20 ft wide.

Who owns Kk Road over Salmon - Trout River?

It is owned by the County Highway Agency.