US Bridges

Mt Olympus Ave over Canal

FairPosted for load

Grays Harbor County, Washington · 0.1 N Discovery · Structure no. 085394000000000

Built
1969
56 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
132 ft
5 main spans
Daily traffic
412
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mt Olympus Ave over Canal is a wood or timber stringer/multi-beam or girder carrying Mt Olympus Ave over Canal in Grays Harbor County, Washington. It was built in 1969, so it is 56 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. Its operating status is: posted for load restriction.

It carries about 412 vehicles a day, roughly 7% of them trucks, projected to reach 581 by 2041. The structure is 132 ft (40.2 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesMt Olympus Ave
CrossesCanal
Location0.1 N Discovery
RouteCity Street 14
CountyGrays Harbor County
StateWashington
Coordinates46.95258, -124.13492
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadH 15
Structure length132 ft (40.2 m)
Longest span32 ft (9.8 m)
Deck width32 ft (9.9 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic412 (2019)
Projected traffic581 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mt Olympus Ave over Canal built?

It was built in 1969, making it 56 years old in 2025.

What condition is Mt Olympus Ave over Canal 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 September 2023.

How much traffic does Mt Olympus Ave over Canal carry?

About 412 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Mt Olympus Ave over Canal?

The structure is 132 ft (40.2 m) long with a longest span of 32 ft (9.8 m) and a deck 32 ft wide.

Who owns Mt Olympus Ave over Canal?

It is owned by the City or Municipal Highway Agency.