US Bridges

County RD 10A over Graydon-Anderson/Slough

Poor

Coos County, Oregon · 0330 from JCT HWY 425 10A · Structure no. 18659 010A00330

Built
2000
25 years old
Condition
Poor
inspected September 2024
Type
Slab
Prestressed Concrete
Length
97 ft
2 main spans
Daily traffic
642
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 10A over Graydon-Anderson/Slough is a prestressed concrete slab carrying County RD 10A over Graydon-Anderson/Slough in Coos County, Oregon. It was built in 2000, so it is 25 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.

It carries about 642 vehicles a day, roughly 10% of them trucks, projected to reach 727 by 2025. The structure is 97 ft (29.6 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty RD 10A
CrossesGraydon-Anderson/Slough
Location0330 from JCT HWY 425 10A
RouteCounty Highway A4170
CountyCoos County
StateOregon
Coordinates43.13714, -124.19577
Functional classRural Major Collector

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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 25 or greater
Structure length97 ft (29.6 m)
Longest span46 ft (14 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic642 (2020)
Projected traffic727 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 10A over Graydon-Anderson/Slough built?

It was built in 2000, making it 25 years old in 2025.

What condition is County RD 10A over Graydon-Anderson/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 September 2024.

How much traffic does County RD 10A over Graydon-Anderson/Slough carry?

About 642 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 10A over Graydon-Anderson/Slough?

The structure is 97 ft (29.6 m) long with a longest span of 46 ft (14 m) and a deck 32 ft wide.

Who owns County RD 10A over Graydon-Anderson/Slough?

It is owned by the County Highway Agency.