US Bridges

US101 (hwy 9) over Cooks Chasm

Good

Lincoln County, Oregon · On Lincoln Linn CO LN · Structure no. 18960 009 16751

Built
2003
22 years old
Condition
Good
inspected July 2023
Type
Arch - Deck
Prestressed Concrete
Length
176 ft
1 main span
Daily traffic
2,862
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Cooks Chasm is a prestressed concrete arch - deck carrying US101 (hwy 9) over Cooks Chasm in Lincoln County, Oregon. It was built in 2003, so it is 22 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 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 2,862 vehicles a day, roughly 8% of them trucks, projected to reach 3,600 by 2042. The structure is 176 ft (53.5 m) long and 44 ft wide. If it were closed, the detour would be 81.4 mi (131 km).

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesCooks Chasm
LocationOn Lincoln Linn CO LN
RouteU.S. Route 101
CountyLincoln County
StateOregon
Coordinates44.27735, -124.11226
Functional classRural Principal Arterial - Other

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating44 US tons
Inventory rating34 US tons

Structure

Structure typeArch - Deck
MaterialPrestressed Concrete
DeckOther
Main spans1 (+2 approach)
Design loadHS 25 or greater
Structure length176 ft (53.5 m)
Longest span126 ft (38.5 m)
Deck width44 ft (13.4 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,862 (2022)
Projected traffic3,600 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed81.4 mi (131 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US101 (hwy 9) over Cooks Chasm built?

It was built in 2003, making it 22 years old in 2025.

What condition is US101 (hwy 9) over Cooks Chasm 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 July 2023.

How much traffic does US101 (hwy 9) over Cooks Chasm carry?

About 2,862 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is US101 (hwy 9) over Cooks Chasm?

The structure is 176 ft (53.5 m) long with a longest span of 126 ft (38.5 m) and a deck 44 ft wide.

Who owns US101 (hwy 9) over Cooks Chasm?

It is owned by the State Highway Agency.