US Bridges

20 TH Ave over Middle Branch River

Fair

Osceola County, Michigan · Section 2/3 T19N R7W · Structure no. 000000000008640

Built
1985
40 years old
Condition
Fair
inspected July 2024
Type
Slab
Wood or Timber
Length
52 ft
2 main spans
Daily traffic
63
2017 count
Owner
County
County Highway Agency

About this bridge

20 TH Ave over Middle Branch River is a wood or timber slab carrying 20 TH Ave over Middle Branch River in Osceola County, Michigan. It was built in 1985, so it is 40 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 63 vehicles a day, roughly 13% of them trucks, projected to reach 120 by 2037. The structure is 52 ft (15.8 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries20 TH Ave
CrossesMiddle Branch River
LocationSection 2/3 T19N R7W
RouteCounty Highway 0
Coordinates44.05856, -85.12752
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 protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length52 ft (15.8 m)
Longest span25 ft (7.6 m)
Deck width36 ft (10.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic63 (2017)
Projected traffic120 by 2037
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 20 TH Ave over Middle Branch River built?

It was built in 1985, making it 40 years old in 2025.

What condition is 20 TH Ave over Middle Branch 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 July 2024.

How much traffic does 20 TH Ave over Middle Branch River carry?

About 63 vehicles per day (2017 count), of which roughly 13% are trucks.

How long is 20 TH Ave over Middle Branch River?

The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 36 ft wide.

Who owns 20 TH Ave over Middle Branch River?

It is owned by the County Highway Agency.