US Bridges

Iris Lane over Irrigation Canal

Fair

Jefferson County, Oregon · 0.3 MI E of HWY 97 · Structure no. 31C012083600085

Built
1970
55 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
380
2020 count
Owner
County
County Highway Agency

About this bridge

Iris Lane over Irrigation Canal is a wood or timber stringer/multi-beam or girder carrying Iris Lane over Irrigation Canal in Jefferson County, Oregon. It was built in 1970, so it is 55 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 6 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: open, posting recommended but not legally implemented.

It carries about 380 vehicles a day, roughly 10% of them trucks, projected to reach 420 by 2025. The structure is 29 ft (8.8 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesIris Lane
CrossesIrrigation Canal
Location0.3 MI E of HWY 97
RouteCounty Highway 0
CountyJefferson County
StateOregon
Coordinates44.52027, -121.16996
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic380 (2020)
Projected traffic420 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Iris Lane over Irrigation Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is Iris Lane over Irrigation Canal 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 November 2024.

How much traffic does Iris Lane over Irrigation Canal carry?

About 380 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Iris Lane over Irrigation Canal?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 24 ft wide.

Who owns Iris Lane over Irrigation Canal?

It is owned by the County Highway Agency.