US Bridges

Mason Road over N. Br. Mill Creek Drain

Fair

St. Clair County, Michigan · Sec. 13-14 Lynn Twp. · Structure no. 000000000010084

Built
1985
40 years old, rebuilt 2011
Condition
Fair
inspected October 2023
Type
Slab
Wood or Timber
Length
84 ft
3 main spans
Daily traffic
1,110
1994 count
Owner
County
County Highway Agency

About this bridge

Mason Road over N. Br. Mill Creek Drain is a wood or timber slab carrying Mason Road over N. Br. Mill Creek Drain in St. Clair County, Michigan. It was built in 1985 and reconstructed in 2011, so it is 40 years old, younger 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 1,110 vehicles a day, roughly 7% of them trucks, projected to reach 1,420 by 2014. The structure is 84 ft (25.6 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMason Road
CrossesN. Br. Mill Creek Drain
LocationSec. 13-14 Lynn Twp.
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.12331, -82.89394
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.9 US tons
Inventory rating61.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHL 93
Structure length84 ft (25.6 m)
Longest span28 ft (8.5 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,110 (1994)
Projected traffic1,420 by 2014
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Mason Road over N. Br. Mill Creek Drain built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2011.

What condition is Mason Road over N. Br. Mill Creek Drain 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 Mason Road over N. Br. Mill Creek Drain carry?

About 1,110 vehicles per day (1994 count), of which roughly 7% are trucks.

How long is Mason Road over N. Br. Mill Creek Drain?

The structure is 84 ft (25.6 m) long with a longest span of 28 ft (8.5 m) and a deck 42 ft wide.

Who owns Mason Road over N. Br. Mill Creek Drain?

It is owned by the County Highway Agency.