US Bridges

Lyman Hill Road over Whetstone Creek

Fair

Columbia County, Washington · 0.01 S JCT 2586 · Structure no. 081190000000000

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
75
2020 count
Owner
County
County Highway Agency

About this bridge

Lyman Hill Road over Whetstone Creek is a steel stringer/multi-beam or girder carrying Lyman Hill Road over Whetstone Creek in Columbia County, Washington. It was built in 1967, so it is 58 years old, older than the Washington average of 49.8 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 75 vehicles a day, roughly 15% of them trucks, projected to reach 100 by 2042. The structure is 22 ft (6.7 m) long and 23 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesLyman Hill Road
CrossesWhetstone Creek
Location0.01 S JCT 2586
RouteCounty Highway 25710
CountyColumbia County
StateWashington
Coordinates46.35526, -118.01331
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOther
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width23 ft (7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2020)
Projected traffic100 by 2042
Trucks15%
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 statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$272,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lyman Hill Road over Whetstone Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Lyman Hill Road over Whetstone Creek 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 Lyman Hill Road over Whetstone Creek carry?

About 75 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Lyman Hill Road over Whetstone Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 23 ft wide.

Who owns Lyman Hill Road over Whetstone Creek?

It is owned by the County Highway Agency.