US Bridges

Cass Road over Boardman River

Good

Grand Traverse County, Michigan · 0.26 MI W of Keystone RD · Structure no. 000000000013969

Built
2016
9 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
261 ft
3 main spans
Daily traffic
7,384
2019 count
Owner
County
County Highway Agency

About this bridge

Cass Road over Boardman River is a prestressed concrete stringer/multi-beam or girder carrying Cass Road over Boardman River in Grand Traverse County, Michigan. It was built in 2016, so it is 9 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 7,384 vehicles a day, roughly 9% of them trucks, projected to reach 14,029 by 2035. The structure is 261 ft (79.6 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCass Road
CrossesBoardman River
Location0.26 MI W of Keystone RD
RouteCounty Highway 2837
CountyGrand Traverse County
StateMichigan
Coordinates44.69867, -85.62342
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 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 alignment7: Better than present minimum criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadGreater than HL 93
Structure length261 ft (79.6 m)
Longest span137 ft (41.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,384 (2019)
Projected traffic14,029 by 2035
Trucks9%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cass Road over Boardman River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Cass Road over Boardman 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 September 2024.

How much traffic does Cass Road over Boardman River carry?

About 7,384 vehicles per day (2019 count), of which roughly 9% are trucks.

How long is Cass Road over Boardman River?

The structure is 261 ft (79.6 m) long with a longest span of 137 ft (41.9 m) and a deck 43 ft wide.

Who owns Cass Road over Boardman River?

It is owned by the County Highway Agency.