US Bridges

Mcpherson Street over Flat River

PoorPosted for load

Kent County, Michigan · 450 Ft E of Fallsbg Pk DR · Structure no. 000000000005085

Built
1969
56 years old
Condition
Poor
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
301 ft
4 main spans
Daily traffic
608
2022 count
Owner
County
County Highway Agency

About this bridge

Mcpherson Street over Flat River is a prestressed concrete box beam or girders - multiple carrying Mcpherson Street over Flat River in Kent County, Michigan. It was built in 1969, so it is 56 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 608 vehicles a day, projected to reach 1,170 by 2025. The structure is 301 ft (91.7 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMcpherson Street
CrossesFlat River
Location450 Ft E of Fallsbg Pk DR
RouteCounty Highway 0
Coordinates42.98667, -85.3324
Functional classRural Minor Collector

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
Deck8 Very GoodNo problems noted.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating52.5 US tons
Inventory rating31.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20 + Mod
Structure length301 ft (91.7 m)
Longest span76 ft (23.1 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic608 (2022)
Projected traffic1,170 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Mcpherson Street over Flat River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Mcpherson Street over Flat 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 September 2024.

How much traffic does Mcpherson Street over Flat River carry?

About 608 vehicles per day (2022 count).

How long is Mcpherson Street over Flat River?

The structure is 301 ft (91.7 m) long with a longest span of 76 ft (23.1 m) and a deck 36 ft wide.

Who owns Mcpherson Street over Flat River?

It is owned by the County Highway Agency.