US Bridges

Glenbrook Road over Portage River

Fair

Livingston County, Michigan · Sec 31-32 Putnam Twp · Structure no. 000000000005833

Built
1960
65 years old
Condition
Fair
inspected October 2024
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
640
2014 count
Owner
County
County Highway Agency

About this bridge

Glenbrook Road over Portage River is a steel culvert carrying Glenbrook Road over Portage River in Livingston County, Michigan. It was built in 1960, so it is 65 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 640 vehicles a day, projected to reach 858 by 2021. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesGlenbrook Road
CrossesPortage River
LocationSec 31-32 Putnam Twp
RouteCounty Highway 0
CountyLivingston County
StateMichigan
Coordinates42.42482, -84.00374
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic640 (2014)
Projected traffic858 by 2021
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Glenbrook Road over Portage River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Glenbrook Road over Portage River 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 2024.

How much traffic does Glenbrook Road over Portage River carry?

About 640 vehicles per day (2014 count).

How long is Glenbrook Road over Portage River?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m).

Who owns Glenbrook Road over Portage River?

It is owned by the County Highway Agency.