US Bridges

I RD SW over Saddle Mountain Wasteway

Good

Grant County, Washington · I SW 1.0 S of 24 · Structure no. 079993000000000

Built
1969
56 years old
Condition
Good
inspected January 2023
Type
Channel Beam
Prestressed Concrete
Length
54 ft
2 main spans
Daily traffic
115
2019 count
Owner
County
County Highway Agency

About this bridge

I RD SW over Saddle Mountain Wasteway is a prestressed concrete channel beam carrying I RD SW over Saddle Mountain Wasteway in Grant County, Washington. It was built in 1969, so it is 56 years old, older than the Washington average of 49.8 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 115 vehicles a day, roughly 29% of them trucks, projected to reach 138 by 2041. The structure is 54 ft (16.5 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesI RD SW
CrossesSaddle Mountain Wasteway
LocationI SW 1.0 S of 24
RouteCounty Highway 10560
Coordinates46.72244, -119.68443
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating36.8 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span26 ft (7.9 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115 (2019)
Projected traffic138 by 2041
Trucks29%
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 statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$821,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I RD SW over Saddle Mountain Wasteway built?

It was built in 1969, making it 56 years old in 2025.

What condition is I RD SW over Saddle Mountain Wasteway 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 January 2023.

How much traffic does I RD SW over Saddle Mountain Wasteway carry?

About 115 vehicles per day (2019 count), of which roughly 29% are trucks.

How long is I RD SW over Saddle Mountain Wasteway?

The structure is 54 ft (16.5 m) long with a longest span of 26 ft (7.9 m) and a deck 28 ft wide.

Who owns I RD SW over Saddle Mountain Wasteway?

It is owned by the County Highway Agency.