US Bridges

Rockwell Road over Portage Creek

Good

Livingston County, Michigan · Sec 31 Unadilla Twp · Structure no. 000000000005894

Built
1990
35 years old
Condition
Good
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
56 ft
2 main spans
Daily traffic
117
2013 count
Owner
County
County Highway Agency

About this bridge

Rockwell Road over Portage Creek is a prestressed concrete tee beam carrying Rockwell Road over Portage Creek in Livingston County, Michigan. It was built in 1990, so it is 35 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 117 vehicles a day, projected to reach 120 by 2021. The structure is 56 ft (17 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesRockwell Road
CrossesPortage Creek
LocationSec 31 Unadilla Twp
RouteCounty Highway 0
CountyLivingston County
StateMichigan
Coordinates42.43402, -84.14072
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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating82.5 US tons
Inventory rating49.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length56 ft (17 m)
Longest span28 ft (8.5 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic117 (2013)
Projected traffic120 by 2021
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Rockwell Road over Portage Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is Rockwell Road over Portage Creek 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 June 2024.

How much traffic does Rockwell Road over Portage Creek carry?

About 117 vehicles per day (2013 count).

How long is Rockwell Road over Portage Creek?

The structure is 56 ft (17 m) long with a longest span of 28 ft (8.5 m) and a deck 32 ft wide.

Who owns Rockwell Road over Portage Creek?

It is owned by the County Highway Agency.