US Bridges

Monohan Landing RD over Wilson Creek

Good

Pacific County, Washington · 4.0 E JCT 105 & 101 · Structure no. 083691000000000

Built
1992
33 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
130 ft
1 main span
Daily traffic
461
2023 count
Owner
County
County Highway Agency

About this bridge

Monohan Landing RD over Wilson Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Monohan Landing RD over Wilson Creek in Pacific County, Washington. It was built in 1992, so it is 33 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 461 vehicles a day, roughly 15% of them trucks, projected to reach 686 by 2043. The structure is 130 ft (39.7 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesMonohan Landing RD
CrossesWilson Creek
Location4.0 E JCT 105 & 101
RouteCounty Highway 96100
Coordinates46.67733, -123.66956
Functional classRural Minor Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating46 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length130 ft (39.7 m)
Longest span123 ft (37.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic461 (2023)
Projected traffic686 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Monohan Landing RD over Wilson Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Monohan Landing RD over Wilson Creek 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 June 2024.

How much traffic does Monohan Landing RD over Wilson Creek carry?

About 461 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Monohan Landing RD over Wilson Creek?

The structure is 130 ft (39.7 m) long with a longest span of 123 ft (37.4 m) and a deck 31 ft wide.

Who owns Monohan Landing RD over Wilson Creek?

It is owned by the County Highway Agency.