US Bridges

County RD 17 over Larson Creek

Fair

Coos County, Oregon · T24S R12W S30 Shorewood · Structure no. 18030 001700090

Built
1997
28 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
141 ft
3 main spans
Daily traffic
321
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 17 over Larson Creek is a prestressed concrete slab carrying County RD 17 over Larson Creek in Coos County, Oregon. It was built in 1997, so it is 28 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 321 vehicles a day, roughly 10% of them trucks, projected to reach 361 by 2025. The structure is 141 ft (43 m) long and 26 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesCounty RD 17
CrossesLarson Creek
LocationT24S R12W S30 Shorewood
RouteCounty Highway C0017
CountyCoos County
StateOregon
Coordinates43.45794, -124.17794
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.9 US tons
Inventory rating76.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length141 ft (43 m)
Longest span48 ft (14.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic321 (2020)
Projected traffic361 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 County RD 17 over Larson Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is County RD 17 over Larson 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 September 2024.

How much traffic does County RD 17 over Larson Creek carry?

About 321 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 17 over Larson Creek?

The structure is 141 ft (43 m) long with a longest span of 48 ft (14.6 m) and a deck 26 ft wide.

Who owns County RD 17 over Larson Creek?

It is owned by the County Highway Agency.