US Bridges

Hill Top RD over Frenchman Springs

Good

Grant County, Washington · Vantage RD 1.0 W Silica · Structure no. 082677000000000

Built
1931
94 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete
Length
72 ft
1 main span
Daily traffic
169
2021 count
Owner
County
County Highway Agency

About this bridge

Hill Top RD over Frenchman Springs is a concrete slab carrying Hill Top RD over Frenchman Springs in Grant County, Washington. It was built in 1931, so it is 94 years old, older 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 169 vehicles a day, roughly 14% of them trucks, projected to reach 350 by 2043. The structure is 72 ft (21.9 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesHill Top RD
CrossesFrenchman Springs
LocationVantage RD 1.0 W Silica
RouteCounty Highway 30520
Coordinates47.03044, -119.95903
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.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span44 ft (13.4 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic169 (2021)
Projected traffic350 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Hill Top RD over Frenchman Springs built?

It was built in 1931, making it 94 years old in 2025.

What condition is Hill Top RD over Frenchman Springs 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 January 2023.

How much traffic does Hill Top RD over Frenchman Springs carry?

About 169 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is Hill Top RD over Frenchman Springs?

The structure is 72 ft (21.9 m) long with a longest span of 44 ft (13.4 m) and a deck 27 ft wide.

Who owns Hill Top RD over Frenchman Springs?

It is owned by the County Highway Agency.