US Bridges

Layng Road over Mosby Creek

FairPosted for load

Lane County, Oregon · 040 MI SE Cottage Grove · Structure no. 39C241254200020

Built
1926
99 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Wood or Timber
Length
135 ft
1 main span
Daily traffic
363
2020 count
Owner
County
County Highway Agency

About this bridge

Layng Road over Mosby Creek is a wood or timber truss - thru carrying Layng Road over Mosby Creek in Lane County, Oregon. It was built in 1926, so it is 99 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. Its operating status is: posted for load restriction.

It carries about 363 vehicles a day, roughly 10% of them trucks, projected to reach 415 by 2025. The structure is 135 ft (41.1 m) long and 15 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesLayng Road
CrossesMosby Creek
Location040 MI SE Cottage Grove
RouteCounty Highway C2542
CountyLane County
StateOregon
Coordinates43.77815, -123.00488
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating13.9 US tons
Inventory rating10.7 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1 (+3 approach)
Design loadH 10
Structure length135 ft (41.1 m)
Longest span90 ft (27.4 m)
Deck width15 ft (4.6 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deck12 ft (3.8 m)

Traffic and service

Average daily traffic363 (2020)
Projected traffic415 by 2025
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$761,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Layng Road over Mosby Creek built?

It was built in 1926, making it 99 years old in 2025.

What condition is Layng Road over Mosby Creek 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 September 2024.

How much traffic does Layng Road over Mosby Creek carry?

About 363 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Layng Road over Mosby Creek?

The structure is 135 ft (41.1 m) long with a longest span of 90 ft (27.4 m) and a deck 15 ft wide.

Who owns Layng Road over Mosby Creek?

It is owned by the County Highway Agency.