US Bridges

Speaker Road over S Br Mill Creek Drain

Good

St. Clair County, Michigan · Sec 13-24 Lynn Twp · Structure no. 000000000010217

Built
2010
15 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
109
2008 count
Owner
County
County Highway Agency

About this bridge

Speaker Road over S Br Mill Creek Drain is a prestressed concrete box beam or girders - multiple carrying Speaker Road over S Br Mill Creek Drain in St. Clair County, Michigan. It was built in 2010, so it is 15 years old, younger 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 109 vehicles a day, roughly 7% of them trucks, projected to reach 162 by 2028. The structure is 110 ft (33.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSpeaker Road
CrossesS Br Mill Creek Drain
LocationSec 13-24 Lynn Twp
RouteCounty Highway 0
Coordinates43.1135, -82.89223
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating93.9 US tons
Inventory rating73.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length110 ft (33.5 m)
Longest span108 ft (32.8 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic109 (2008)
Projected traffic162 by 2028
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Speaker Road over S Br Mill Creek Drain built?

It was built in 2010, making it 15 years old in 2025.

What condition is Speaker Road over S Br Mill Creek Drain 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 October 2024.

How much traffic does Speaker Road over S Br Mill Creek Drain carry?

About 109 vehicles per day (2008 count), of which roughly 7% are trucks.

How long is Speaker Road over S Br Mill Creek Drain?

The structure is 110 ft (33.5 m) long with a longest span of 108 ft (32.8 m) and a deck 31 ft wide.

Who owns Speaker Road over S Br Mill Creek Drain?

It is owned by the County Highway Agency.