US Bridges

County RD 68 over South Slough

PoorPosted for load

Coos County, Oregon · South Slough · Structure no. 11C75E006800118

Built
1977
48 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
119 ft
8 main spans
Daily traffic
27
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 68 over South Slough is a wood or timber stringer/multi-beam or girder carrying County RD 68 over South Slough in Coos County, Oregon. It was built in 1977, so it is 48 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 27 vehicles a day, roughly 1% of them trucks, projected to reach 31 by 2025. The structure is 119 ft (36.3 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty RD 68
CrossesSouth Slough
LocationSouth Slough
RouteCounty Highway C0068
CountyCoos County
StateOregon
Coordinates43.2762, -124.31972
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating7.8 US tons
Inventory rating6.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans8
Design loadH 15
Structure length119 ft (36.3 m)
Longest span15 ft (4.6 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2020)
Projected traffic31 by 2025
Trucks1%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 68 over South Slough built?

It was built in 1977, making it 48 years old in 2025.

What condition is County RD 68 over South 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 July 2024.

How much traffic does County RD 68 over South Slough carry?

About 27 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is County RD 68 over South Slough?

The structure is 119 ft (36.3 m) long with a longest span of 15 ft (4.6 m) and a deck 20 ft wide.

Who owns County RD 68 over South Slough?

It is owned by the County Highway Agency.