US Bridges

Hillside RD over Sigitowitz Creek

FairPosted for load

Whatcom County, Washington · 01.0 S.W. Potter RD · Structure no. 082474000000000

Built
1950
75 years old, rebuilt 1973
Condition
Fair
inspected January 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
250
2019 count
Owner
County
County Highway Agency

About this bridge

Hillside RD over Sigitowitz Creek is a concrete channel beam carrying Hillside RD over Sigitowitz Creek in Whatcom County, Washington. It was built in 1950 and reconstructed in 1973, so it is 75 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 250 vehicles a day, roughly 5% of them trucks, projected to reach 300 by 2041. The structure is 31 ft (9.4 m) long and 26 ft wide.

CarriesHillside RD
CrossesSigitowitz Creek
Location01.0 S.W. Potter RD
RouteCounty Highway 89630
Coordinates48.7718, -122.22342
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.
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 inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 rating20.9 US tons
Inventory rating15 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2019)
Projected traffic300 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hillside RD over Sigitowitz Creek built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1973.

What condition is Hillside RD over Sigitowitz 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 January 2023.

How much traffic does Hillside RD over Sigitowitz Creek carry?

About 250 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Hillside RD over Sigitowitz Creek?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 26 ft wide.

Who owns Hillside RD over Sigitowitz Creek?

It is owned by the County Highway Agency.