US Bridges

Pentoga Road over Brule River

FairPosted for load

Iron County, Michigan · 2.5 MI S of RD424 Pentoga · Structure no. 000000000004197

Built
1924
101 years old, rebuilt 1988
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
64 ft
1 main span
Daily traffic
3
1994 count
Owner
County
County Highway Agency

About this bridge

Pentoga Road over Brule River is a steel truss - thru carrying Pentoga Road over Brule River in Iron County, Michigan. It was built in 1924 and reconstructed in 1988, so it is 101 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 3 vehicles a day, projected to reach 3 by 2014. The structure is 64 ft (19.5 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesPentoga Road
CrossesBrule River
Location2.5 MI S of RD424 Pentoga
RouteCounty Highway 0
CountyIron County
StateMichigan
Coordinates46.00185, -88.50057
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23.3 US tons
Inventory rating13.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length64 ft (19.5 m)
Longest span60 ft (18.2 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3 (1994)
Projected traffic3 by 2014
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Pentoga Road over Brule River built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1988.

What condition is Pentoga Road over Brule River 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 September 2024.

How much traffic does Pentoga Road over Brule River carry?

About 3 vehicles per day (1994 count).

How long is Pentoga Road over Brule River?

The structure is 64 ft (19.5 m) long with a longest span of 60 ft (18.2 m) and a deck 18 ft wide.

Who owns Pentoga Road over Brule River?

It is owned by the County Highway Agency.