US Bridges

County RD S554 over Salmon Trout River

Good

Houghton County, Michigan · 0.1 MI W Redridge · Structure no. 000000000012870

Built
1979
46 years old
Condition
Good
inspected October 2023
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
250
1999 count
Owner
County
County Highway Agency

About this bridge

County RD S554 over Salmon Trout River is a steel culvert carrying County RD S554 over Salmon Trout River in Houghton 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 250 vehicles a day, roughly 3% of them trucks, projected to reach 250 by 2019. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesCounty RD S554
CrossesSalmon Trout River
Location0.1 MI W Redridge
RouteCounty Highway 0
CountyHoughton County
StateMichigan
Coordinates47.15033, -88.76499
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating13.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.7 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (1999)
Projected traffic250 by 2019
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 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 County RD S554 over Salmon Trout River built?

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

What condition is County RD S554 over Salmon Trout River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does County RD S554 over Salmon Trout River carry?

About 250 vehicles per day (1999 count), of which roughly 3% are trucks.

How long is County RD S554 over Salmon Trout River?

The structure is 25 ft (7.7 m) long with a longest span of 11 ft (3.5 m).

Who owns County RD S554 over Salmon Trout River?

It is owned by the County Highway Agency.