US Bridges

Gunn Road over Penn Central Railroad

Fair

Oakland County, Michigan · Bet Adams & Orion RD · Structure no. 000000000008208

Built
1989
36 years old
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
90 ft
1 main span
Daily traffic
352
1997 count
Owner
County
County Highway Agency

About this bridge

Gunn Road over Penn Central Railroad is a wood or timber slab carrying Gunn Road over Penn Central Railroad in Oakland County, Michigan. It was built in 1989, so it is 36 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 352 vehicles a day, roughly 5% of them trucks, projected to reach 500 by 2017. The structure is 90 ft (27.4 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesGunn Road
CrossesPenn Central Railroad
LocationBet Adams & Orion RD
RouteCounty Highway 0
CountyOakland County
StateMichigan
Coordinates42.73985, -83.17545
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.5 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic352 (1997)
Projected traffic500 by 2017
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gunn Road over Penn Central Railroad built?

It was built in 1989, making it 36 years old in 2025.

What condition is Gunn Road over Penn Central Railroad 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 Gunn Road over Penn Central Railroad carry?

About 352 vehicles per day (1997 count), of which roughly 5% are trucks.

How long is Gunn Road over Penn Central Railroad?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns Gunn Road over Penn Central Railroad?

It is owned by the County Highway Agency.