US Bridges

Mikkalo Lane over Hay Creek

Fair

Gilliam County, Oregon · 7.3 MI W of HWY 19 · Structure no. 21C13 663 00500

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
81 ft
3 main spans
Daily traffic
13
2020 count
Owner
County
County Highway Agency

About this bridge

Mikkalo Lane over Hay Creek is a concrete continuous tee beam carrying Mikkalo Lane over Hay Creek in Gilliam County, Oregon. It was built in 1964, so it is 61 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 13 vehicles a day, roughly 10% of them trucks, projected to reach 15 by 2025. The structure is 81 ft (24.7 m) long and 29 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesMikkalo Lane
CrossesHay Creek
Location7.3 MI W of HWY 19
RouteCounty Highway 0
CountyGilliam County
StateOregon
Coordinates45.4723, -120.3123
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13 (2020)
Projected traffic15 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 Mikkalo Lane over Hay Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Mikkalo Lane over Hay 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 July 2023.

How much traffic does Mikkalo Lane over Hay Creek carry?

About 13 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mikkalo Lane over Hay Creek?

The structure is 81 ft (24.7 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns Mikkalo Lane over Hay Creek?

It is owned by the County Highway Agency.