US Bridges

Harper Ave over Clinton River Spillway

Good

Macomb County, Michigan · 0.6 MI North of 16 Mile · Structure no. 000000000006264

Built
1951
74 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
340 ft
5 main spans
Daily traffic
11,600
2021 count
Owner
County
County Highway Agency

About this bridge

Harper Ave over Clinton River Spillway is a steel stringer/multi-beam or girder carrying Harper Ave over Clinton River Spillway in Macomb County, Michigan. It was built in 1951, so it is 74 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,600 vehicles a day, roughly 2% of them trucks, projected to reach 11,700 by 2041. The structure is 340 ft (103.6 m) long and 49 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHarper Ave
CrossesClinton River Spillway
Location0.6 MI North of 16 Mile
RouteCounty Highway 2058
CountyMacomb County
StateMichigan
Coordinates42.57673, -82.87129
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.4 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length340 ft (103.6 m)
Longest span90 ft (27.4 m)
Deck width49 ft (14.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,600 (2021)
Projected traffic11,700 by 2041
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Harper Ave over Clinton River Spillway built?

It was built in 1951, making it 74 years old in 2025.

What condition is Harper Ave over Clinton River Spillway 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 June 2024.

How much traffic does Harper Ave over Clinton River Spillway carry?

About 11,600 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Harper Ave over Clinton River Spillway?

The structure is 340 ft (103.6 m) long with a longest span of 90 ft (27.4 m) and a deck 49 ft wide.

Who owns Harper Ave over Clinton River Spillway?

It is owned by the County Highway Agency.