US Bridges

Aldrich Point RD over Gnat Creek

Fair

Clatsop County, Oregon · 05 MI from HWY 30 · Structure no. 11124A020100002

Built
1986
39 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
134 ft
2 main spans
Daily traffic
225
2020 count
Owner
County
County Highway Agency

About this bridge

Aldrich Point RD over Gnat Creek is a prestressed concrete slab carrying Aldrich Point RD over Gnat Creek in Clatsop County, Oregon. It was built in 1986, so it is 39 years old, younger than the Oregon average of 49.9 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.

It carries about 225 vehicles a day, roughly 10% of them trucks, projected to reach 235 by 2025. The structure is 134 ft (40.8 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAldrich Point RD
CrossesGnat Creek
Location05 MI from HWY 30
RouteCounty Highway A0736
CountyClatsop County
StateOregon
Coordinates46.18853, -123.53478
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating27.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 25 or greater
Structure length134 ft (40.8 m)
Longest span66 ft (20.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2020)
Projected traffic235 by 2025
Trucks10%
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Aldrich Point RD over Gnat Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Aldrich Point RD over Gnat 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 March 2023.

How much traffic does Aldrich Point RD over Gnat Creek carry?

About 225 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Aldrich Point RD over Gnat Creek?

The structure is 134 ft (40.8 m) long with a longest span of 66 ft (20.1 m) and a deck 28 ft wide.

Who owns Aldrich Point RD over Gnat Creek?

It is owned by the County Highway Agency.