US Bridges

County RD 708 over Jackson Cr/Senic Ave

Fair

Jackson County, Oregon · 0.86 Milepost · Structure no. 29C105708 00086

Built
1939
86 years old, rebuilt 1964
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
1,945
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 708 over Jackson Cr/Senic Ave is a prestressed concrete slab carrying County RD 708 over Jackson Cr/Senic Ave in Jackson County, Oregon. It was built in 1939 and reconstructed in 1964, so it is 86 years old, older 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 5 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 1,945 vehicles a day, roughly 10% of them trucks, projected to reach 2,270 by 2025. The structure is 24 ft (7.3 m) long and 24 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCounty RD 708
CrossesJackson Cr/Senic Ave
Location0.86 Milepost
RouteCounty Highway C0708
CountyJackson County
StateOregon
Coordinates42.38937, -122.93649
Functional classUrban Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width24 ft (7.3 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,945 (2020)
Projected traffic2,270 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$123,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 708 over Jackson Cr/Senic Ave built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1964.

What condition is County RD 708 over Jackson Cr/Senic Ave 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 July 2023.

How much traffic does County RD 708 over Jackson Cr/Senic Ave carry?

About 1,945 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 708 over Jackson Cr/Senic Ave?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.

Who owns County RD 708 over Jackson Cr/Senic Ave?

It is owned by the County Highway Agency.