US Bridges

Main ST over Mineral River

Poor

Ontonagon County, Michigan · 360 Ft W of Linden ST · Structure no. 000000000014633

Built
1955
70 years old
Condition
Poor
inspected October 2024
Type
Culvert
Steel
Length
45 ft
1 main span
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Main ST over Mineral River is a steel culvert carrying Main ST over Mineral River in Ontonagon County, Michigan. It was built in 1955, so it is 70 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 250 vehicles a day, roughly 1% of them trucks, projected to reach 288 by 2043. The structure is 45 ft (13.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMain ST
CrossesMineral River
Location360 Ft W of Linden ST
RouteCounty Highway 0
CountyOntonagon County
StateMichigan
Coordinates46.75234, -89.57669
Functional classRural Minor Arterial

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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span45 ft (13.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic288 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Main ST over Mineral River built?

It was built in 1955, making it 70 years old in 2025.

What condition is Main ST over Mineral 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 October 2024.

How much traffic does Main ST over Mineral River carry?

About 250 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Main ST over Mineral River?

The structure is 45 ft (13.7 m) long with a longest span of 45 ft (13.7 m).

Who owns Main ST over Mineral River?

It is owned by the County Highway Agency.