US Bridges

County RD 7A over Haynes Slough

Poor

Coos County, Oregon · 2.75 Miles N of Northbend · Structure no. 11C112007A00275

Built
1971
54 years old
Condition
Poor
inspected July 2024
Type
Slab
Prestressed Concrete Continuous
Length
30 ft
3 main spans
Daily traffic
1,733
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 7A over Haynes Slough is a prestressed concrete continuous slab carrying County RD 7A over Haynes Slough in Coos County, Oregon. It was built in 1971, so it is 54 years old, older 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 1,733 vehicles a day, roughly 10% of them trucks, projected to reach 1,958 by 2025. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty RD 7A
CrossesHaynes Slough
Location2.75 Miles N of Northbend
RouteCounty Highway 0A435
CountyCoos County
StateOregon
Coordinates43.46571, -124.18965
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 inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckOther
Main spans3
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span10 ft (3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,733 (2020)
Projected traffic1,958 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 7A over Haynes Slough built?

It was built in 1971, making it 54 years old in 2025.

What condition is County RD 7A over Haynes 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 7A over Haynes Slough carry?

About 1,733 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 7A over Haynes Slough?

The structure is 30 ft (9.1 m) long with a longest span of 10 ft (3 m) and a deck 28 ft wide.

Who owns County RD 7A over Haynes Slough?

It is owned by the County Highway Agency.