US Bridges

68th Street over N Br of Black River

PoorPosted for load

Allegan County, Michigan · Just N of 108th Ave · Structure no. 000000000000220

Built
1968
57 years old
Condition
Poor
inspected May 2024
Type
Slab
Wood or Timber
Length
52 ft
2 main spans
Daily traffic
273
2002 count
Owner
County
County Highway Agency

About this bridge

68th Street over N Br of Black River is a wood or timber slab carrying 68th Street over N Br of Black River in Allegan County, Michigan. It was built in 1968, so it is 57 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 273 vehicles a day, roughly 7% of them trucks, projected to reach 546 by 2022. The structure is 52 ft (15.8 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries68th Street
CrossesN Br of Black River
LocationJust N of 108th Ave
RouteCounty Highway 0
Coordinates42.47684, -86.207
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating27.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length52 ft (15.8 m)
Longest span26 ft (7.9 m)
Deck width29 ft (8.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic273 (2002)
Projected traffic546 by 2022
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 68th Street over N Br of Black River built?

It was built in 1968, making it 57 years old in 2025.

What condition is 68th Street over N Br of Black River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does 68th Street over N Br of Black River carry?

About 273 vehicles per day (2002 count), of which roughly 7% are trucks.

How long is 68th Street over N Br of Black River?

The structure is 52 ft (15.8 m) long with a longest span of 26 ft (7.9 m) and a deck 29 ft wide.

Who owns 68th Street over N Br of Black River?

It is owned by the County Highway Agency.