US Bridges

Mushroom Road over Middle Br Drain

PoorPosted for load

Sanilac County, Michigan · Sec 2-11 Moore Twp · Structure no. 000000000009643

Built
1984
41 years old
Condition
Poor
inspected January 2025
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
150
2016 count
Owner
County
County Highway Agency

About this bridge

Mushroom Road over Middle Br Drain is a steel culvert carrying Mushroom Road over Middle Br Drain in Sanilac County, Michigan. It was built in 1984, so it is 41 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 150 vehicles a day, roughly 10% of them trucks, projected to reach 270 by 2036. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMushroom Road
CrossesMiddle Br Drain
LocationSec 2-11 Moore Twp
RouteCounty Highway 0
CountySanilac County
StateMichigan
Coordinates43.49246, -82.90127
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJanuary 2025
Inspection intervalevery 3 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating33.2 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length25 ft (7.7 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2016)
Projected traffic270 by 2036
Trucks10%
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 Mushroom Road over Middle Br Drain built?

It was built in 1984, making it 41 years old in 2025.

What condition is Mushroom Road over Middle Br Drain in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does Mushroom Road over Middle Br Drain carry?

About 150 vehicles per day (2016 count), of which roughly 10% are trucks.

How long is Mushroom Road over Middle Br Drain?

The structure is 25 ft (7.7 m) long with a longest span of 11 ft (3.3 m).

Who owns Mushroom Road over Middle Br Drain?

It is owned by the County Highway Agency.