US Bridges

Seymour Road over Shiawassee River

Poor

Genesee County, Michigan · W of Inter Seymour & Cole · Structure no. 000000000002735

Built
1930
95 years old
Condition
Poor
inspected November 2024
Type
Tee Beam
Concrete
Length
27 ft
1 main span
Daily traffic
3,587
2003 count
Owner
County
County Highway Agency

About this bridge

Seymour Road over Shiawassee River is a concrete tee beam carrying Seymour Road over Shiawassee River in Genesee County, Michigan. It was built in 1930, so it is 95 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 3,587 vehicles a day, roughly 5% of them trucks, projected to reach 6,479 by 2023. The structure is 27 ft (8.2 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesSeymour Road
CrossesShiawassee River
LocationW of Inter Seymour & Cole
RouteCounty Highway 2515
Coordinates42.80728, -83.83992
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,587 (2003)
Projected traffic6,479 by 2023
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Seymour Road over Shiawassee River built?

It was built in 1930, making it 95 years old in 2025.

What condition is Seymour Road over Shiawassee River 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 November 2024.

How much traffic does Seymour Road over Shiawassee River carry?

About 3,587 vehicles per day (2003 count), of which roughly 5% are trucks.

How long is Seymour Road over Shiawassee River?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 31 ft wide.

Who owns Seymour Road over Shiawassee River?

It is owned by the County Highway Agency.