US Bridges

120th Ave over S Branch Pentwater River

Fair

Oceana County, Michigan · .25 MI North of Lever RD · Structure no. 000000000008374

Built
1955
70 years old
Condition
Fair
inspected August 2024
Type
Culvert
Wood or Timber
Length
24 ft
4 main spans
Daily traffic
500
2005 count
Owner
County
County Highway Agency

About this bridge

120th Ave over S Branch Pentwater River is a wood or timber culvert carrying 120th Ave over S Branch Pentwater River in Oceana County, Michigan. It was built in 1955, so it is 70 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.

It carries about 500 vehicles a day, roughly 5% of them trucks, projected to reach 900 by 2025. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
Carries120th Ave
CrossesS Branch Pentwater River
Location.25 MI North of Lever RD
RouteCounty Highway 0
CountyOceana County
StateMichigan
Coordinates43.72579, -86.25798
Functional classRural Minor 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialWood or Timber
DeckNot applicable
Main spans4
Design loadH 20
Structure length24 ft (7.3 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2005)
Projected traffic900 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 120th Ave over S Branch Pentwater River built?

It was built in 1955, making it 70 years old in 2025.

What condition is 120th Ave over S Branch Pentwater 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 August 2024.

How much traffic does 120th Ave over S Branch Pentwater River carry?

About 500 vehicles per day (2005 count), of which roughly 5% are trucks.

How long is 120th Ave over S Branch Pentwater River?

The structure is 24 ft (7.3 m) long with a longest span of 6 ft (1.8 m).

Who owns 120th Ave over S Branch Pentwater River?

It is owned by the County Highway Agency.