US Bridges

20 Mile RD over Middle Branch River

Good

Osceola County, Michigan · 1.5 MI E of M-115 · Structure no. 000000000008602

Built
1938
87 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
40 ft
2 main spans
Daily traffic
1,850
2017 count
Owner
County
County Highway Agency

About this bridge

20 Mile RD over Middle Branch River is a concrete culvert carrying 20 Mile RD over Middle Branch River in Osceola County, Michigan. It was built in 1938, so it is 87 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,850 vehicles a day, roughly 3% of them trucks, projected to reach 3,600 by 2037. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries20 Mile RD
CrossesMiddle Branch River
Location1.5 MI E of M-115
RouteCounty Highway 61
CountyOsceola County
StateMichigan
Coordinates44.10233, -85.2162
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2017)
Projected traffic3,600 by 2037
Trucks3%
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$12,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 20 Mile RD over Middle Branch River built?

It was built in 1938, making it 87 years old in 2025.

What condition is 20 Mile RD over Middle Branch River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does 20 Mile RD over Middle Branch River carry?

About 1,850 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is 20 Mile RD over Middle Branch River?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m).

Who owns 20 Mile RD over Middle Branch River?

It is owned by the County Highway Agency.