US Bridges

Towerline Road over Johnson Creek

Fair

Iosco County, Michigan · 0.5 MI S of N Sec. Line · Structure no. 000000000004150

Built
1988
37 years old
Condition
Fair
inspected June 2024
Type
Slab
Wood or Timber
Length
52 ft
3 main spans
Daily traffic
160
2006 count
Owner
County
County Highway Agency

About this bridge

Towerline Road over Johnson Creek is a wood or timber slab carrying Towerline Road over Johnson Creek in Iosco County, Michigan. It was built in 1988, so it is 37 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 160 vehicles a day, roughly 5% of them trucks, projected to reach 300 by 2026. The structure is 52 ft (15.8 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesTowerline Road
CrossesJohnson Creek
Location0.5 MI S of N Sec. Line
RouteCounty Highway 0
CountyIosco County
StateMichigan
Coordinates44.19888, -83.78338
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span29 ft (8.8 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2006)
Projected traffic300 by 2026
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Towerline Road over Johnson Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Towerline Road over Johnson Creek 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 June 2024.

How much traffic does Towerline Road over Johnson Creek carry?

About 160 vehicles per day (2006 count), of which roughly 5% are trucks.

How long is Towerline Road over Johnson Creek?

The structure is 52 ft (15.8 m) long with a longest span of 29 ft (8.8 m) and a deck 31 ft wide.

Who owns Towerline Road over Johnson Creek?

It is owned by the County Highway Agency.