US Bridges

120 TH Avenue over N Br Pentwater River

Fair

Oceana County, Michigan · 3 MI NW of Crystal Valley · Structure no. 000000000008373

Built
1953
72 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
1,000
2005 count
Owner
County
County Highway Agency

About this bridge

120 TH Avenue over N Br Pentwater River is a concrete tee beam carrying 120 TH Avenue over N Br Pentwater River in Oceana County, Michigan. It was built in 1953, so it is 72 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 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 1,000 vehicles a day, projected to reach 1,300 by 2024. The structure is 30 ft (9.1 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
Carries120 TH Avenue
CrossesN Br Pentwater River
Location3 MI NW of Crystal Valley
RouteCounty Highway 6476
CountyOceana County
StateMichigan
Coordinates43.81422, -86.25837
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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 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
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span27 ft (8.2 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2005)
Projected traffic1,300 by 2024
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 120 TH Avenue over N Br Pentwater River built?

It was built in 1953, making it 72 years old in 2025.

What condition is 120 TH Avenue over N Br 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 120 TH Avenue over N Br Pentwater River carry?

About 1,000 vehicles per day (2005 count).

How long is 120 TH Avenue over N Br Pentwater River?

The structure is 30 ft (9.1 m) long with a longest span of 27 ft (8.2 m) and a deck 30 ft wide.

Who owns 120 TH Avenue over N Br Pentwater River?

It is owned by the County Highway Agency.