US Bridges

Mcgregor Road over Portage Lake Outlet

Good

Washtenaw County, Michigan · Dexter Twp Section 1 · Structure no. 000000000010995

Built
2016
9 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
4,932
2016 count
Owner
County
County Highway Agency

About this bridge

Mcgregor Road over Portage Lake Outlet is a prestressed concrete box beam or girders - single or spread carrying Mcgregor Road over Portage Lake Outlet in Washtenaw County, Michigan. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,932 vehicles a day, roughly 9% of them trucks, projected to reach 5,450 by 2036. The structure is 50 ft (15.2 m) long and 41 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesMcgregor Road
CrossesPortage Lake Outlet
LocationDexter Twp Section 1
RouteCounty Highway 0
CountyWashtenaw County
StateMichigan
Coordinates42.41547, -83.90787
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating106.8 US tons
Inventory rating82.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length50 ft (15.2 m)
Longest span48 ft (14.5 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,932 (2016)
Projected traffic5,450 by 2036
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 Mcgregor Road over Portage Lake Outlet built?

It was built in 2016, making it 9 years old in 2025.

What condition is Mcgregor Road over Portage Lake Outlet 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 July 2024.

How much traffic does Mcgregor Road over Portage Lake Outlet carry?

About 4,932 vehicles per day (2016 count), of which roughly 9% are trucks.

How long is Mcgregor Road over Portage Lake Outlet?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.5 m) and a deck 41 ft wide.

Who owns Mcgregor Road over Portage Lake Outlet?

It is owned by the County Highway Agency.