US Bridges

Patterson Lake RD over Portage River

Good

Livingston County, Michigan · Sec 33 Putnam Twp · Structure no. 000000000005807

Built
1991
34 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
2,017
2013 count
Owner
County
County Highway Agency

About this bridge

Patterson Lake RD over Portage River is a prestressed concrete box beam or girders - multiple carrying Patterson Lake RD over Portage River in Livingston County, Michigan. It was built in 1991, so it is 34 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 2,017 vehicles a day, projected to reach 5,470 by 2021. The structure is 60 ft (18.2 m) long and 45 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesPatterson Lake RD
CrossesPortage River
LocationSec 33 Putnam Twp
RouteCounty Highway 4706
CountyLivingston County
StateMichigan
Coordinates42.43648, -83.9675
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating34.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.2 m)
Longest span56 ft (17 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,017 (2013)
Projected traffic5,470 by 2021
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Patterson Lake RD over Portage River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Patterson Lake RD over Portage River 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 Patterson Lake RD over Portage River carry?

About 2,017 vehicles per day (2013 count).

How long is Patterson Lake RD over Portage River?

The structure is 60 ft (18.2 m) long with a longest span of 56 ft (17 m) and a deck 45 ft wide.

Who owns Patterson Lake RD over Portage River?

It is owned by the County Highway Agency.