US Bridges

Lyman Hamilton HWY over Childs Creek

FairPosted for load

Skagit County, Washington · 0.8 E JCT SR 20 · Structure no. 082415000000000

Built
1948
77 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
525
2021 count
Owner
County
County Highway Agency

About this bridge

Lyman Hamilton HWY over Childs Creek is a concrete tee beam carrying Lyman Hamilton HWY over Childs Creek in Skagit County, Washington. It was built in 1948, so it is 77 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. Its operating status is: posted for load restriction.

It carries about 525 vehicles a day, roughly 8% of them trucks, projected to reach 780 by 2041. The structure is 32 ft (9.8 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLyman Hamilton HWY
CrossesChilds Creek
Location0.8 E JCT SR 20
RouteCounty Highway 94020
Coordinates48.52642, -122.092
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic525 (2021)
Projected traffic780 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lyman Hamilton HWY over Childs Creek built?

It was built in 1948, making it 77 years old in 2025.

What condition is Lyman Hamilton HWY over Childs 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 May 2024.

How much traffic does Lyman Hamilton HWY over Childs Creek carry?

About 525 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Lyman Hamilton HWY over Childs Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Lyman Hamilton HWY over Childs Creek?

It is owned by the County Highway Agency.