US Bridges

21 Mile RD over Pine River

Good

Osceola County, Michigan · Section 17/20 T20N R10W · Structure no. 000000000008621

Built
1980
45 years old
Condition
Good
inspected August 2024
Type
Culvert
Steel
Length
22 ft
1 main span
Daily traffic
44
2017 count
Owner
County
County Highway Agency

About this bridge

21 Mile RD over Pine River is a steel culvert carrying 21 Mile RD over Pine 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 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 44 vehicles a day, roughly 2% of them trucks, projected to reach 100 by 2037. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries21 Mile RD
CrossesPine River
LocationSection 17/20 T20N R10W
RouteCounty Highway 0
CountyOsceola County
StateMichigan
Coordinates44.1178, -85.5363
Functional classRural Local

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating88.6 US tons
Inventory rating56.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2017)
Projected traffic100 by 2037
Trucks2%
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 Pine River built?

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

What condition is 21 Mile RD over Pine 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 August 2024.

How much traffic does 21 Mile RD over Pine River carry?

About 44 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is 21 Mile RD over Pine River?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m).

Who owns 21 Mile RD over Pine River?

It is owned by the County Highway Agency.