US Bridges

Harmon Lake Road over S. O. Drain

Fair

Tuscola County, Michigan · Sec 6-7 Dayton Twp · Structure no. 000000000010566

Built
1997
28 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
85
2009 count
Owner
County
County Highway Agency

About this bridge

Harmon Lake Road over S. O. Drain is a concrete culvert carrying Harmon Lake Road over S. O. Drain in Tuscola County, Michigan. It was built in 1997, so it is 28 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 85 vehicles a day, projected to reach 150 by 2029. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesHarmon Lake Road
CrossesS. O. Drain
LocationSec 6-7 Dayton Twp
RouteCounty Highway 0
CountyTuscola County
StateMichigan
Coordinates43.39504, -83.33662
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length22 ft (6.7 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 traffic85 (2009)
Projected traffic150 by 2029
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Harmon Lake Road over S. O. Drain built?

It was built in 1997, making it 28 years old in 2025.

What condition is Harmon Lake Road over S. O. Drain 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 April 2023.

How much traffic does Harmon Lake Road over S. O. Drain carry?

About 85 vehicles per day (2009 count).

How long is Harmon Lake Road over S. O. Drain?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m).

Who owns Harmon Lake Road over S. O. Drain?

It is owned by the County Highway Agency.