US Bridges

1647000 over Summit Creek

Good

Grant County, Oregon · 16 RD E to 1647 - S 4.3 M · Structure no. 060404000035637

Built
2024
1 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
10
2018 count
Owner
Federal
U.S. Forest Service

About this bridge

1647000 over Summit Creek is a prestressed concrete slab carrying 1647000 over Summit Creek in Grant County, Oregon. It was built in 2024, so it is 1 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10 vehicles a day, projected to reach 15 by 2045. The structure is 48 ft (14.6 m) long and 23 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
Carries1647000
CrossesSummit Creek
Location16 RD E to 1647 - S 4.3 M
RouteFederal Lands Road 16470
CountyGrant County
StateOregon
Coordinates44.12757, -118.57826
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable 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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating63.2 US tons
Inventory rating48.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length48 ft (14.6 m)
Longest span46 ft (13.9 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic15 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 1647000 over Summit Creek built?

It was built in 2024, making it 1 years old in 2025.

What condition is 1647000 over Summit Creek 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 August 2024.

How much traffic does 1647000 over Summit Creek carry?

About 10 vehicles per day (2018 count).

How long is 1647000 over Summit Creek?

The structure is 48 ft (14.6 m) long with a longest span of 46 ft (13.9 m) and a deck 23 ft wide.

Who owns 1647000 over Summit Creek?

It is owned by the U.S. Forest Service.