US Bridges

21 Mile RD over Middle Branch River

Fair

Osceola County, Michigan · Section 17/20 T20N R7W · Structure no. 000000000008635

Built
1980
45 years old
Condition
Fair
inspected July 2024
Type
Culvert
Steel
Length
32 ft
2 main spans
Daily traffic
477
2000 count
Owner
County
County Highway Agency

About this bridge

21 Mile RD over Middle Branch River is a steel culvert carrying 21 Mile RD over Middle Branch River in Osceola County, Michigan. It was built in 1980, so it is 45 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 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 477 vehicles a day, projected to reach 859 by 2020. The structure is 32 ft (9.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries21 Mile RD
CrossesMiddle Branch River
LocationSection 17/20 T20N R7W
RouteCounty Highway 0
CountyOsceola County
StateMichigan
Coordinates44.11688, -85.17641
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating40 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length32 ft (9.7 m)
Longest span15 ft (4.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic477 (2000)
Projected traffic859 by 2020
Trucks0%
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 21 Mile RD over Middle Branch River built?

It was built in 1980, making it 45 years old in 2025.

What condition is 21 Mile RD 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 21 Mile RD over Middle Branch River carry?

About 477 vehicles per day (2000 count).

How long is 21 Mile RD over Middle Branch River?

The structure is 32 ft (9.7 m) long with a longest span of 15 ft (4.5 m).

Who owns 21 Mile RD over Middle Branch River?

It is owned by the County Highway Agency.