US Bridges

Leer Road over N Thunder Bay River

Good

Presque Isle County, Michigan · 5 MI SW of Posen · Structure no. 000000000008981

Built
1968
57 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
2 main spans
Daily traffic
610
2007 count
Owner
County
County Highway Agency

About this bridge

Leer Road over N Thunder Bay River is a steel stringer/multi-beam or girder carrying Leer Road over N Thunder Bay River in Presque Isle County, Michigan. It was built in 1968, so it is 57 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 610 vehicles a day, projected to reach 610 by 2027. The structure is 80 ft (24.4 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLeer Road
CrossesN Thunder Bay River
Location5 MI SW of Posen
RouteCounty Highway 7159
CountyPresque Isle County
StateMichigan
Coordinates45.22069, -83.73912
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.9 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length80 ft (24.4 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic610 (2007)
Projected traffic610 by 2027
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Leer Road over N Thunder Bay River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Leer Road over N Thunder Bay 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 September 2023.

How much traffic does Leer Road over N Thunder Bay River carry?

About 610 vehicles per day (2007 count).

How long is Leer Road over N Thunder Bay River?

The structure is 80 ft (24.4 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Leer Road over N Thunder Bay River?

It is owned by the County Highway Agency.