US Bridges

US101 (hwy 9) over Lake Lytle Outlet

Fair

Tillamook County, Oregon · 007 MI N Rockaway · Structure no. 02349 009 04923

Built
1938
87 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
153 ft
7 main spans
Daily traffic
6,303
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Lake Lytle Outlet is a wood or timber stringer/multi-beam or girder carrying US101 (hwy 9) over Lake Lytle Outlet in Tillamook County, Oregon. It was built in 1938, so it is 87 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 6,303 vehicles a day, roughly 4% of them trucks, projected to reach 6,400 by 2042. The structure is 153 ft (46.6 m) long and 35 ft wide. If it were closed, the detour would be 55.9 mi (90 km).

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesLake Lytle Outlet
Location007 MI N Rockaway
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.63546, -123.94077
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be 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 rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length153 ft (46.6 m)
Longest span27 ft (8.2 m)
Deck width35 ft (10.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,303 (2022)
Projected traffic6,400 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed55.9 mi (90 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$784,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US101 (hwy 9) over Lake Lytle Outlet built?

It was built in 1938, making it 87 years old in 2025.

What condition is US101 (hwy 9) over Lake Lytle Outlet 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 March 2023.

How much traffic does US101 (hwy 9) over Lake Lytle Outlet carry?

About 6,303 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Lake Lytle Outlet?

The structure is 153 ft (46.6 m) long with a longest span of 27 ft (8.2 m) and a deck 35 ft wide.

Who owns US101 (hwy 9) over Lake Lytle Outlet?

It is owned by the State Highway Agency.