US Bridges

Lakeshore Drive over Bass Lake Outlet

Fair

Mason County, Michigan · 1 MI N of Oceana CO Line · Structure no. 000000000006659

Built
1900
125 years old, rebuilt 1972
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
1,000
1997 count
Owner
County
County Highway Agency

About this bridge

Lakeshore Drive over Bass Lake Outlet is a prestressed concrete box beam or girders - multiple carrying Lakeshore Drive over Bass Lake Outlet in Mason County, Michigan. It was built in 1900 and reconstructed in 1972, so it is 125 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,500 by 2017. The structure is 32 ft (9.7 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLakeshore Drive
CrossesBass Lake Outlet
Location1 MI N of Oceana CO Line
RouteCounty Highway 5317
CountyMason County
StateMichigan
Coordinates43.83133, -86.42594
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be 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 rating64.6 US tons
Inventory rating38.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length32 ft (9.7 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (1997)
Projected traffic1,500 by 2017
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Lakeshore Drive over Bass Lake Outlet built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1972.

What condition is Lakeshore Drive over Bass Lake Outlet in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does Lakeshore Drive over Bass Lake Outlet carry?

About 1,000 vehicles per day (1997 count), of which roughly 10% are trucks.

How long is Lakeshore Drive over Bass Lake Outlet?

The structure is 32 ft (9.7 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns Lakeshore Drive over Bass Lake Outlet?

It is owned by the County Highway Agency.