US Bridges

Mcmanamon Rd. over Potholes East Canal

Good

Adams County, Washington · 0.86 Mi. NW Lee RD · Structure no. 089052000000000

Built
2019
6 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
161 ft
1 main span
Daily traffic
1,238
2019 count
Owner
County
County Highway Agency

About this bridge

Mcmanamon Rd. over Potholes East Canal is a prestressed concrete stringer/multi-beam or girder carrying Mcmanamon Rd. over Potholes East Canal in Adams County, Washington. It was built in 2019, so it is 6 years old, younger than the Washington average of 49.8 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 1,238 vehicles a day, roughly 29% of them trucks, projected to reach 1,250 by 2041. The structure is 161 ft (49.2 m) long and 35 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

CarriesMcmanamon Rd.
CrossesPotholes East Canal
Location0.86 Mi. NW Lee RD
RouteCounty Highway 12711
Coordinates46.85316, -119.17526
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
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 alignment6: Equal to present minimum criteria
Operating rating63.9 US tons
Inventory rating45.3 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length161 ft (49.2 m)
Longest span156 ft (47.4 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,238 (2019)
Projected traffic1,250 by 2041
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$2.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mcmanamon Rd. over Potholes East Canal built?

It was built in 2019, making it 6 years old in 2025.

What condition is Mcmanamon Rd. over Potholes East Canal 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 November 2023.

How much traffic does Mcmanamon Rd. over Potholes East Canal carry?

About 1,238 vehicles per day (2019 count), of which roughly 29% are trucks.

How long is Mcmanamon Rd. over Potholes East Canal?

The structure is 161 ft (49.2 m) long with a longest span of 156 ft (47.4 m) and a deck 35 ft wide.

Who owns Mcmanamon Rd. over Potholes East Canal?

It is owned by the County Highway Agency.