US Bridges

Potato Hill RD over I-90

Good

Grant County, Washington · 1.5 E JCT SR 171 · Structure no. 0017071A0000000

Built
2006
19 years old
Condition
Good
inspected February 2021
Type
Slab
Prestressed Concrete
Length
133 ft
2 main spans
Daily traffic
4,037
2010 count
Owner
State
State Highway Agency

About this bridge

Potato Hill RD over I-90 is a prestressed concrete slab carrying Potato Hill RD over I-90 in Grant County, Washington. It was built in 2006, so it is 19 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 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 4,037 vehicles a day, roughly 9% of them trucks, projected to reach 5,611 by 2036. The structure is 133 ft (40.5 m) long and 70 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesPotato Hill RD
CrossesI-90
Location1.5 E JCT SR 171
RouteCity Street 0
CountyGrant County
StateWashington
Coordinates47.10248, -119.27846
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length133 ft (40.5 m)
Longest span66 ft (20.1 m)
Deck width70 ft (21.4 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,037 (2010)
Projected traffic5,611 by 2036
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Potato Hill RD over I-90 built?

It was built in 2006, making it 19 years old in 2025.

What condition is Potato Hill RD over I-90 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 February 2021.

How much traffic does Potato Hill RD over I-90 carry?

About 4,037 vehicles per day (2010 count), of which roughly 9% are trucks.

How long is Potato Hill RD over I-90?

The structure is 133 ft (40.5 m) long with a longest span of 66 ft (20.1 m) and a deck 70 ft wide.

Who owns Potato Hill RD over I-90?

It is owned by the State Highway Agency.