US Bridges

Huron Line Road over Tyre I/C Drain Ext

Poor

Sanilac County, Michigan · Austin Twp Sec 5 & 6 · Structure no. 000000000013256

Built
1974
51 years old
Condition
Poor
inspected June 2024
Type
Culvert
Steel
Length
21 ft
2 main spans
Daily traffic
40
1996 count
Owner
County
County Highway Agency

About this bridge

Huron Line Road over Tyre I/C Drain Ext is a steel culvert carrying Huron Line Road over Tyre I/C Drain Ext in Sanilac County, Michigan. It was built in 1974, so it is 51 years old, older 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 4 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.

It carries about 40 vehicles a day, roughly 5% of them trucks, projected to reach 55 by 2016. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHuron Line Road
CrossesTyre I/C Drain Ext
LocationAustin Twp Sec 5 & 6
RouteCounty Highway 0
CountySanilac County
StateMichigan
Coordinates43.67981, -82.97812
Functional classRural Minor Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.5 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1996)
Projected traffic55 by 2016
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Huron Line Road over Tyre I/C Drain Ext built?

It was built in 1974, making it 51 years old in 2025.

What condition is Huron Line Road over Tyre I/C Drain Ext 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 June 2024.

How much traffic does Huron Line Road over Tyre I/C Drain Ext carry?

About 40 vehicles per day (1996 count), of which roughly 5% are trucks.

How long is Huron Line Road over Tyre I/C Drain Ext?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Huron Line Road over Tyre I/C Drain Ext?

It is owned by the County Highway Agency.