US Bridges

Brennan Road over Sullivan Drain

Fair

St. Clair County, Michigan · Sec 19 Kenockee Twp · Structure no. 000000000010195

Built
1971
54 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
51
1994 count
Owner
County
County Highway Agency

About this bridge

Brennan Road over Sullivan Drain is a prestressed concrete tee beam carrying Brennan Road over Sullivan Drain in St. Clair County, Michigan. It was built in 1971, so it is 54 years old, older 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 51 vehicles a day, projected to reach 60 by 2014. The structure is 29 ft (8.8 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesBrennan Road
CrossesSullivan Drain
LocationSec 19 Kenockee Twp
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.02308, -82.74965
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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
Deck geometry7: Better than present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating45.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length29 ft (8.8 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51 (1994)
Projected traffic60 by 2014
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Brennan Road over Sullivan Drain built?

It was built in 1971, making it 54 years old in 2025.

What condition is Brennan Road over Sullivan 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 Brennan Road over Sullivan Drain carry?

About 51 vehicles per day (1994 count).

How long is Brennan Road over Sullivan Drain?

The structure is 29 ft (8.8 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns Brennan Road over Sullivan Drain?

It is owned by the County Highway Agency.