US Bridges

Seneca HWY over Raisin River S Branch

Poor

Lenawee County, Michigan · 0.2 MI S of M-34 · Structure no. 000000000013281

Built
1978
47 years old
Condition
Poor
inspected December 2024
Type
Culvert
Steel
Length
20 ft
2 main spans
Daily traffic
340
2006 count
Owner
County
County Highway Agency

About this bridge

Seneca HWY over Raisin River S Branch is a steel culvert carrying Seneca HWY over Raisin River S Branch in Lenawee County, Michigan. It was built in 1978, so it is 47 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 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 340 vehicles a day, roughly 1% of them trucks, projected to reach 400 by 2025. The structure is 20 ft (6.2 m) long.

Location

Open in Google Maps
CarriesSeneca HWY
CrossesRaisin River S Branch
Location0.2 MI S of M-34
RouteCounty Highway 0
CountyLenawee County
StateMichigan
Coordinates41.85548, -84.179
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: 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 rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length20 ft (6.2 m)
Longest span9 ft (2.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2006)
Projected traffic400 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$300,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Seneca HWY over Raisin River S Branch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Seneca HWY over Raisin River S Branch 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 December 2024.

How much traffic does Seneca HWY over Raisin River S Branch carry?

About 340 vehicles per day (2006 count), of which roughly 1% are trucks.

How long is Seneca HWY over Raisin River S Branch?

The structure is 20 ft (6.2 m) long with a longest span of 9 ft (2.8 m).

Who owns Seneca HWY over Raisin River S Branch?

It is owned by the County Highway Agency.