US Bridges

J R Anderson RD over Mason Creek

Fair

Clark County, Washington · 0.2W Mason Ck RD · Structure no. 080787000000000

Built
1959
66 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
24 ft
1 main span
Daily traffic
446
2021 count
Owner
County
County Highway Agency

About this bridge

J R Anderson RD over Mason Creek is a concrete stringer/multi-beam or girder carrying J R Anderson RD over Mason Creek in Clark County, Washington. It was built in 1959, so it is 66 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 6 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 446 vehicles a day, roughly 5% of them trucks, projected to reach 600 by 2038. The structure is 24 ft (7.3 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesJ R Anderson RD
CrossesMason Creek
Location0.2W Mason Ck RD
RouteCounty Highway 62100
Coordinates45.84202, -122.59058
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic446 (2021)
Projected traffic600 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was J R Anderson RD over Mason Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is J R Anderson RD over Mason 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 April 2023.

How much traffic does J R Anderson RD over Mason Creek carry?

About 446 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is J R Anderson RD over Mason Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.

Who owns J R Anderson RD over Mason Creek?

It is owned by the County Highway Agency.