US Bridges

Bald Hills Road over Lackamas Creek

Good

Thurston County, Washington · 7.7 M S Baldhills RD · Structure no. 087419000000000

Built
2006
19 years old
Condition
Good
inspected August 2023
Type
Slab
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
3,480
2020 count
Owner
County
County Highway Agency

About this bridge

Bald Hills Road over Lackamas Creek is a prestressed concrete slab carrying Bald Hills Road over Lackamas Creek in Thurston County, Washington. It was built in 2006, so it is 19 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 3,480 vehicles a day, roughly 15% of them trucks, projected to reach 5,068 by 2042. The structure is 29 ft (8.8 m) long and 39 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesBald Hills Road
CrossesLackamas Creek
Location7.7 M S Baldhills RD
RouteCounty Highway 10241
Coordinates46.85692, -122.50273
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum 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 alignment6: Equal to present minimum criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width39 ft (11.9 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,480 (2020)
Projected traffic5,068 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Bald Hills Road over Lackamas Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is Bald Hills Road over Lackamas 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 August 2023.

How much traffic does Bald Hills Road over Lackamas Creek carry?

About 3,480 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Bald Hills Road over Lackamas Creek?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 39 ft wide.

Who owns Bald Hills Road over Lackamas Creek?

It is owned by the County Highway Agency.