US Bridges

Silver Lake Road over Lobdell Lake Dam

Fair

Genesee County, Michigan · E of South Leg of Seymour · Structure no. 000000000002703

Built
1929
96 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
34 ft
1 main span
Daily traffic
10,073
2018 count
Owner
Local
Other Local Agency

About this bridge

Silver Lake Road over Lobdell Lake Dam is a concrete tee beam carrying Silver Lake Road over Lobdell Lake Dam in Genesee County, Michigan. It was built in 1929, so it is 96 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 10,073 vehicles a day, roughly 5% of them trucks, projected to reach 18,193 by 2038. The structure is 34 ft (10.4 m) long and 53 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesSilver Lake Road
CrossesLobdell Lake Dam
LocationE of South Leg of Seymour
RouteCounty Highway 2508
CountyGenesee County
StateMichigan
Coordinates42.79147, -83.84465
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating32.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length34 ft (10.4 m)
Longest span32 ft (9.7 m)
Deck width53 ft (16.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,073 (2018)
Projected traffic18,193 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local 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 Silver Lake Road over Lobdell Lake Dam built?

It was built in 1929, making it 96 years old in 2025.

What condition is Silver Lake Road over Lobdell Lake Dam 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 May 2023.

How much traffic does Silver Lake Road over Lobdell Lake Dam carry?

About 10,073 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Silver Lake Road over Lobdell Lake Dam?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.7 m) and a deck 53 ft wide.

Who owns Silver Lake Road over Lobdell Lake Dam?

It is owned by the Other Local Agency and maintained by the County Highway Agency.