US Bridges

Sink Road over Dowagiac River

Good

Cass County, Michigan · 5 MI N of Sumneville · Structure no. 000000000001456

Built
2019
6 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
413
2018 count
Owner
County
County Highway Agency

About this bridge

Sink Road over Dowagiac River is a prestressed concrete box beam or girders - multiple carrying Sink Road over Dowagiac River in Cass County, Michigan. It was built in 2019, so it is 6 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 413 vehicles a day, projected to reach 631 by 2038. The structure is 80 ft (24.4 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSink Road
CrossesDowagiac River
Location5 MI N of Sumneville
RouteCounty Highway 0
CountyCass County
StateMichigan
Coordinates41.94579, -86.18994
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating67.9 US tons
Inventory rating45.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length80 ft (24.4 m)
Longest span77 ft (23.5 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic413 (2018)
Projected traffic631 by 2038
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$255,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Sink Road over Dowagiac River built?

It was built in 2019, making it 6 years old in 2025.

What condition is Sink Road over Dowagiac River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Sink Road over Dowagiac River carry?

About 413 vehicles per day (2018 count).

How long is Sink Road over Dowagiac River?

The structure is 80 ft (24.4 m) long with a longest span of 77 ft (23.5 m) and a deck 31 ft wide.

Who owns Sink Road over Dowagiac River?

It is owned by the County Highway Agency.