US Bridges

Dahlin Road over Mercer Lake/Laverdierecr

Fair

Lane County, Oregon · 013 MI E HWY 101 · Structure no. 39C564523300002

Built
1980
45 years old
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
360 ft
13 main spans
Daily traffic
152
2020 count
Owner
County
County Highway Agency

About this bridge

Dahlin Road over Mercer Lake/Laverdierecr is a prestressed concrete slab carrying Dahlin Road over Mercer Lake/Laverdierecr in Lane County, Oregon. It was built in 1980, so it is 45 years old, younger 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 152 vehicles a day, roughly 2% of them trucks, projected to reach 177 by 2025. The structure is 360 ft (109.7 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesDahlin Road
CrossesMercer Lake/Laverdierecr
Location013 MI E HWY 101
RouteCounty Highway C5233
CountyLane County
StateOregon
Coordinates44.06621, -124.06916
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans13
Design loadHS 20
Structure length360 ft (109.7 m)
Longest span29 ft (8.8 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic152 (2020)
Projected traffic177 by 2025
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Dahlin Road over Mercer Lake/Laverdierecr built?

It was built in 1980, making it 45 years old in 2025.

What condition is Dahlin Road over Mercer Lake/Laverdierecr 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 2023.

How much traffic does Dahlin Road over Mercer Lake/Laverdierecr carry?

About 152 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Dahlin Road over Mercer Lake/Laverdierecr?

The structure is 360 ft (109.7 m) long with a longest span of 29 ft (8.8 m) and a deck 16 ft wide.

Who owns Dahlin Road over Mercer Lake/Laverdierecr?

It is owned by the County Highway Agency.