US Bridges

West Knight Street over Spring Brook

Fair

Eaton County, Michigan · In City of Eaton Rapids · Structure no. 000000000002441

Built
1982
43 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
80 ft
2 main spans
Daily traffic
1,850
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

West Knight Street over Spring Brook is a prestressed concrete box beam or girders - multiple carrying West Knight Street over Spring Brook in Eaton County, Michigan. It was built in 1982, so it is 43 years old, younger 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.

It carries about 1,850 vehicles a day, roughly 4% of them trucks, projected to reach 2,300 by 2031. The structure is 80 ft (24.4 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesWest Knight Street
CrossesSpring Brook
LocationIn City of Eaton Rapids
RouteCity Street 2324
CountyEaton County
StateMichigan
Coordinates42.51289, -84.65724
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span39 ft (11.8 m)
Deck width38 ft (11.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2011)
Projected traffic2,300 by 2031
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
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 West Knight Street over Spring Brook built?

It was built in 1982, making it 43 years old in 2025.

What condition is West Knight Street over Spring Brook 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 West Knight Street over Spring Brook carry?

About 1,850 vehicles per day (2011 count), of which roughly 4% are trucks.

How long is West Knight Street over Spring Brook?

The structure is 80 ft (24.4 m) long with a longest span of 39 ft (11.8 m) and a deck 38 ft wide.

Who owns West Knight Street over Spring Brook?

It is owned by the City or Municipal Highway Agency.