Skip to Main Content View Text-Only

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

GENERAL INFORMATION: 503-823-7404

1120 SW Fifth Ave, Suite 600, Portland, OR 97204

More Contact Info

Subscribe to RSS feed

Most Recent

View More

It truly was a very wet year

1 Comment

Graph of annual precipitation at Headworks 1899-2012The Bull Run watershed -- Portland’s primary source of drinking water -- had a lot of rainfall in 2012, far more than in most years.

The precipitation in 2012 was 100.73 inches of rainfall at the Headworks Treatment Facility, where records have been kept since 1899. It was the 9th wettest calendar year on record, which puts the year in the 90th percentile.

To put the rainfall in perspective, the last time there was over 100 inches in a calendar year was in 1996  -- during the big February flood -- when the level reached 112.14 inches. Before that, it was in 1953 with 102.06 inches. As seen on the graph, most of the years with over 100 inches of rain recorded at the Water Bureau’s Headworks facility were between 1933 and 1953.

Precipitation is also measured at three SNOTEL* sites in the watershed: at the South Fork of the Bull Run River, the North Fork of the Bull Run River, and at Blazed Alder Creek. These precipitation records do not date back as far, but 2012 was a very wet year:

  • 146.5 inches at South Fork (2690’ elevation)
  • 195.8 inches at North Fork (3060’ elevation)
  • 145.8 inches at Blazed Alder (3650’ elevation)

When compared with the 1996 precipitation, there were 196.0 inches at North Fork and 179.0 inches at Blazed Alder (South Forth was not yet established in 1996).

So, all the rain in 2012 was not just in your imagination.

Doug Bloem
Hydrologist

* SNOw TELemetry. Stations operated by the Natural Resources Conservation Service (NRCS) Snow Survey. Each station measures air temperature, precipitation, snow depth and snow water equivalent (SWE, pronounced “swee”), which is based on the weight of the snowpack and reflects the depth that the snow would be if it all melted in place. The station takes hourly readings and uploads them via radio to the Snow Survey’s data facility from where it’s put out on the web.

Links: 

1 Comment

1

goldenagemuse

January 3, 2013 at 11:26 PM

So how are those emergency fish runs doing? All washed out or is the PWB still laying pipe for their FISHY regional water plan hidden agenda? Endangered species, my A**.

Please review our Code of Conduct rules before posting a comment to this site.
Report Abuse (Please include the specific topic and comment for the fastest response/resolution.)

Post a Comment
Name
E-mail (visible to admins only)
 Remember Info Yes   No
Comments
Spam Prevention In the Pacific Northwest, what state is Portland in?