US Bridges

Blum Lane over Dougherty Slough

PoorPosted for load

Tillamook County, Oregon · 015 NE of Tillamook · Structure no. 57C36 698 00045

Built
1989
36 years old
Condition
Poor
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Steel
Length
87 ft
1 main span
Daily traffic
15
2020 count
Owner
County
County Highway Agency

About this bridge

Blum Lane over Dougherty Slough is a steel box beam or girders - single or spread carrying Blum Lane over Dougherty Slough in Tillamook County, Oregon. It was built in 1989, so it is 36 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 15 vehicles a day, projected to reach 18 by 2025. The structure is 87 ft (26.5 m) long and 13 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBlum Lane
CrossesDougherty Slough
Location015 NE of Tillamook
RouteCounty Highway C0698
StateOregon
Coordinates45.4704, -123.82419
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating9.3 US tons
Inventory rating7.2 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 15
Structure length87 ft (26.5 m)
Longest span76 ft (23.2 m)
Deck width13 ft (4.1 m)
Roadway width11 ft (3.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2020)
Projected traffic18 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$446,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Blum Lane over Dougherty Slough built?

It was built in 1989, making it 36 years old in 2025.

What condition is Blum Lane over Dougherty Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Blum Lane over Dougherty Slough carry?

About 15 vehicles per day (2020 count).

How long is Blum Lane over Dougherty Slough?

The structure is 87 ft (26.5 m) long with a longest span of 76 ft (23.2 m) and a deck 13 ft wide.

Who owns Blum Lane over Dougherty Slough?

It is owned by the County Highway Agency.