US Bridges

County RD 17G over Larson Creek

Good

Coos County, Oregon · 0530 on County RD #17 · Structure no. 11C40A001700530

Built
1985
40 years old
Condition
Good
inspected September 2024
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
78
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 17G over Larson Creek is a prestressed concrete slab carrying County RD 17G over Larson Creek in Coos County, Oregon. It was built in 1985, so it is 40 years old, younger than the Oregon average of 49.9 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 78 vehicles a day, roughly 1% of them trucks, projected to reach 88 by 2025. The structure is 48 ft (14.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesCounty RD 17G
CrossesLarson Creek
Location0530 on County RD #17
RouteCounty Highway 17G
StateOregon
Coordinates43.4869, -124.1221
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span46 ft (14 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78 (2020)
Projected traffic88 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 17G over Larson Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is County RD 17G over Larson 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 September 2024.

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

About 78 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is County RD 17G over Larson Creek?

The structure is 48 ft (14.6 m) long with a longest span of 46 ft (14 m) and a deck 20 ft wide.

Who owns County RD 17G over Larson Creek?

It is owned by the County Highway Agency.