Umatilla Basin Project Water Data


Home \| About Us \| News \| Programs & Activities \| Library \| Water Operations \| Site Index

Umatilla Basin Project
Water Data

Umatilla Project - Main Page

Project Water Supply

Current Conditions:

Reservoir Storage

Major Storage Reservoirs in the Umatilla River Basin

Weather Conditions (NOAA)

Foothills of the Blue Mountains, Oregon

Lower Columbia Basin, Oregon

Precipitation

Streamflow

Umatilla River near Umatilla, Oregon (USGS)
Umatilla River at West Reservation Boundary near Pendleton (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Columbia River Snowpack Summary
Mountain Snowpack Maps for Columbia River Basin

Drought Index

Palmer Drought Index Map
Explanation of Palmer Drought Severity Index (Text)

Historic Conditions:

Annual Precipitation

Normal	16.30 in
Maximum - 1983	23.37 in
Minimum - 1967	11.52 in
Pendleton, Oregon 1961-1990

Temperature

Mean Annual	50.5 °F
Daily Maximum - 08/04/1961	115 °F
Daily Minimum - 01/26/1957	-30 °F
Pendleton, Oregon 1956-1996
Growing Season	187 days
Elevation of irrigable area	470 ft

Umatilla River

Drainage area at Yoakum, Oregon	1,280 mi²
Annual discharge:
Maximum - 1917	804,391 acre-ft
Minimum - 1966	257,519 acre-ft
Average - 1903-1996	487,526 acre-ft

Streamflows: Umatilla River at Yoakum, Oregon (USGS)

McKay Creek

Drainage area at Pilot Rock,Oregon	186 mi²
Annual discharge:
Maximum - 1984	128,805 acre-ft
Minimum - 1977	30,294 acre-ft
Average - 1918-1991	71,017 acre-ft

Project Water Quality

Dams | Projects | Powerplants | Contact Us | Maps | Glossary | FAQ´s | Links