US Bridges

Napier Road over M-14

Fair

Wayne County, Michigan · 3 MI W of Plymouth · Structure no. 000000000011355

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
305 ft
4 main spans
Daily traffic
65,500
2006 count
Owner
State
State Highway Agency

About this bridge

Napier Road over M-14 is a steel stringer/multi-beam or girder carrying Napier Road over M-14 in Wayne County, Michigan. It was built in 1975, so it is 50 years old, older 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 5 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 65,500 vehicles a day, roughly 10% of them trucks, projected to reach 80,000 by 2026. The structure is 305 ft (92.9 m) long and 48 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNapier Road
CrossesM-14
Location3 MI W of Plymouth
RouteCounty Highway 0
CountyWayne County
StateMichigan
Coordinates42.36713, -83.54837
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating50.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length305 ft (92.9 m)
Longest span106 ft (32.3 m)
Deck width48 ft (14.6 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,500 (2006)
Projected traffic80,000 by 2026
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$215,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Napier Road over M-14 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Napier Road over M-14 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 October 2023.

How much traffic does Napier Road over M-14 carry?

About 65,500 vehicles per day (2006 count), of which roughly 10% are trucks.

How long is Napier Road over M-14?

The structure is 305 ft (92.9 m) long with a longest span of 106 ft (32.3 m) and a deck 48 ft wide.

Who owns Napier Road over M-14?

It is owned by the State Highway Agency.