US Bridges

20th Street over Schnable Brook

Good

Allegan County, Michigan · 0.08 MI S of 112th Avenue · Structure no. 000000000013842

Built
2014
11 years old
Condition
Good
inspected April 2023
Type
Slab
Wood or Timber
Length
26 ft
1 main span
Daily traffic
50
2014 count
Owner
County
County Highway Agency

About this bridge

20th Street over Schnable Brook is a wood or timber slab carrying 20th Street over Schnable Brook in Allegan County, Michigan. It was built in 2014, so it is 11 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 65 by 2034. The structure is 26 ft (7.9 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries20th Street
CrossesSchnable Brook
Location0.08 MI S of 112th Avenue
RouteCounty Highway 20
CountyAllegan County
StateMichigan
Coordinates42.50771, -85.74089
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHL 93
Structure length26 ft (7.9 m)
Longest span24 ft (7.2 m)
Deck width33 ft (10.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2014)
Projected traffic65 by 2034
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 20th Street over Schnable Brook built?

It was built in 2014, making it 11 years old in 2025.

What condition is 20th Street over Schnable Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does 20th Street over Schnable Brook carry?

About 50 vehicles per day (2014 count).

How long is 20th Street over Schnable Brook?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.2 m) and a deck 33 ft wide.

Who owns 20th Street over Schnable Brook?

It is owned by the County Highway Agency.