US Bridges

Gardner Road over E Branch Ontonogon River

PoorPosted for load

Ontonagon County, Michigan · 12 MI N of Trout Creek · Structure no. 000000000008527

Built
1954
71 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
111 ft
2 main spans
Daily traffic
100
1997 count
Owner
County
County Highway Agency

About this bridge

Gardner Road over E Branch Ontonogon River is a steel continuous stringer/multi-beam or girder carrying Gardner Road over E Branch Ontonogon River in Ontonagon County, Michigan. It was built in 1954, so it is 71 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, projected to reach 200 by 2017. The structure is 111 ft (33.8 m) long and 18 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesGardner Road
CrossesE Branch Ontonogon River
Location12 MI N of Trout Creek
RouteCounty Highway 0
Coordinates46.65846, -89.04664
Functional classRural Major Collector

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating26.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length111 ft (33.8 m)
Longest span51 ft (15.5 m)
Deck width18 ft (5.5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1997)
Projected traffic200 by 2017
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$340,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Gardner Road over E Branch Ontonogon River built?

It was built in 1954, making it 71 years old in 2025.

What condition is Gardner Road over E Branch Ontonogon 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 Gardner Road over E Branch Ontonogon River carry?

About 100 vehicles per day (1997 count).

How long is Gardner Road over E Branch Ontonogon River?

The structure is 111 ft (33.8 m) long with a longest span of 51 ft (15.5 m) and a deck 18 ft wide.

Who owns Gardner Road over E Branch Ontonogon River?

It is owned by the County Highway Agency.