US Bridges

M-14 (old) over Tonquish Creek

Fair

Wayne County, Michigan · 0.3 MI E Main ST Plymouth · Structure no. 000000000011346

Built
1926
99 years old, rebuilt 1974
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
32,679
2007 count
Owner
State
State Highway Agency

About this bridge

M-14 (old) over Tonquish Creek is a concrete culvert carrying M-14 (old) over Tonquish Creek in Wayne County, Michigan. It was built in 1926 and reconstructed in 1974, so it is 99 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 32,679 vehicles a day, roughly 1% of them trucks, projected to reach 50,105 by 2018. The structure is 20 ft (6.1 m) long.

Location

Open in Google Maps
CarriesM-14 (old)
CrossesTonquish Creek
Location0.3 MI E Main ST Plymouth
RouteState Highway 14
CountyWayne County
StateMichigan
Coordinates42.35883, -83.46552
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating56.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span19 ft (5.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,679 (2007)
Projected traffic50,105 by 2018
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$18,000 (2050 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was M-14 (old) over Tonquish Creek built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1974.

What condition is M-14 (old) over Tonquish Creek 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 M-14 (old) over Tonquish Creek carry?

About 32,679 vehicles per day (2007 count), of which roughly 1% are trucks.

How long is M-14 (old) over Tonquish Creek?

The structure is 20 ft (6.1 m) long with a longest span of 19 ft (5.7 m).

Who owns M-14 (old) over Tonquish Creek?

It is owned by the State Highway Agency.