US Bridges

Pontiac RD over Sylvan Lake

FairPosted for load

Oakland County, Michigan · 0.6 MI N of Orchard Lake · Structure no. 000000000008306

Built
1900
125 years old
Condition
Fair
inspected June 2024
Type
Arch - Deck
Concrete
Length
28 ft
1 main span
Daily traffic
180
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

Pontiac RD over Sylvan Lake is a concrete arch - deck carrying Pontiac RD over Sylvan Lake in Oakland County, Michigan. It was built in 1900, 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 180 vehicles a day, projected to reach 180 by 2036. The structure is 28 ft (8.5 m) long and 21 ft wide.

Location

Open in Google Maps
CarriesPontiac RD
CrossesSylvan Lake
Location0.6 MI N of Orchard Lake
RouteCity Street 0
CountyOakland County
StateMichigan
Coordinates42.61871, -83.33443
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating24.5 US tons
Inventory rating14.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2016)
Projected traffic180 by 2036
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Pontiac RD over Sylvan Lake built?

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

What condition is Pontiac RD over Sylvan Lake 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 June 2024.

How much traffic does Pontiac RD over Sylvan Lake carry?

About 180 vehicles per day (2016 count).

How long is Pontiac RD over Sylvan Lake?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m) and a deck 21 ft wide.

Who owns Pontiac RD over Sylvan Lake?

It is owned by the City or Municipal Highway Agency.