US Bridges

State Parkway over Huron River

FairPosted for load

Livingston County, Michigan · 3.7 MI SW Park Entrance · Structure no. 000000000013706

Built
1976
49 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
500
2010 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

State Parkway over Huron River is a steel stringer/multi-beam or girder carrying State Parkway over Huron River in Livingston County, Michigan. It was built in 1976, so it is 49 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. Its operating status is: posted for load restriction.

It carries about 500 vehicles a day, projected to reach 575 by 2030. The structure is 65 ft (19.8 m) long and 29 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

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CarriesState Parkway
CrossesHuron River
Location3.7 MI SW Park Entrance
RouteState Lands Road 0
CountyLivingston County
StateMichigan
Coordinates42.4952, -83.7345
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.3 US tons
Inventory rating29.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length65 ft (19.8 m)
Longest span61 ft (18.6 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2010)
Projected traffic575 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Parkway over Huron River built?

It was built in 1976, making it 49 years old in 2025.

What condition is State Parkway over Huron River 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 July 2023.

How much traffic does State Parkway over Huron River carry?

About 500 vehicles per day (2010 count).

How long is State Parkway over Huron River?

The structure is 65 ft (19.8 m) long with a longest span of 61 ft (18.6 m) and a deck 29 ft wide.

Who owns State Parkway over Huron River?

It is owned by the State Park, Forest, or Reservation Agency.