US Bridges

Cascade RD over Thornapple River

Fair

Kent County, Michigan · 0.20 MI S of 28th Streeet · Structure no. 000000000005018

Built
1983
42 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
220 ft
3 main spans
Daily traffic
22,250
2005 count
Owner
County
County Highway Agency

About this bridge

Cascade RD over Thornapple River is a prestressed concrete box beam or girders - multiple carrying Cascade RD over Thornapple River in Kent County, Michigan. It was built in 1983, so it is 42 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 22,250 vehicles a day, projected to reach 37,830 by 2025. The structure is 220 ft (67 m) long and 73 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCascade RD
CrossesThornapple River
Location0.20 MI S of 28th Streeet
RouteCounty Highway 2001
CountyKent County
StateMichigan
Coordinates42.91123, -85.49695
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating47.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length220 ft (67 m)
Longest span76 ft (23.1 m)
Deck width73 ft (22.2 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,250 (2005)
Projected traffic37,830 by 2025
Trucks0%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 Cascade RD over Thornapple River built?

It was built in 1983, making it 42 years old in 2025.

What condition is Cascade RD over Thornapple 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 November 2023.

How much traffic does Cascade RD over Thornapple River carry?

About 22,250 vehicles per day (2005 count).

How long is Cascade RD over Thornapple River?

The structure is 220 ft (67 m) long with a longest span of 76 ft (23.1 m) and a deck 73 ft wide.

Who owns Cascade RD over Thornapple River?

It is owned by the County Highway Agency.