US Bridges

Brennan Road over Big Potato Creek

Poor

Saginaw County, Michigan · 0.9 MI N of Brant Road · Structure no. 000000000009321

Built
1973
52 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
122
2023 count
Owner
County
County Highway Agency

About this bridge

Brennan Road over Big Potato Creek is a steel stringer/multi-beam or girder carrying Brennan Road over Big Potato Creek in Saginaw County, Michigan. It was built in 1973, so it is 52 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 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.

It carries about 122 vehicles a day, roughly 5% of them trucks, projected to reach 130 by 2033. The structure is 32 ft (9.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesBrennan Road
CrossesBig Potato Creek
Location0.9 MI N of Brant Road
RouteCounty Highway 0
Coordinates43.27174, -84.24911
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 20
Structure length32 ft (9.7 m)
Longest span29 ft (8.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic122 (2023)
Projected traffic130 by 2033
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Brennan Road over Big Potato Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Brennan Road over Big Potato Creek 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 October 2024.

How much traffic does Brennan Road over Big Potato Creek carry?

About 122 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Brennan Road over Big Potato Creek?

The structure is 32 ft (9.7 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.

Who owns Brennan Road over Big Potato Creek?

It is owned by the County Highway Agency.