Bull Run Lake

Infobox lake
lake_name = Bull Run Lake
image_lake = P6060026.jpg
caption_lake =
image_bathymetry =
caption_bathymetry =
location = Oregon
coords = coord|45|43|34.73|N|120|41|39.79|W|type:waterbody_region:US-OR_elevation:964|display=inline,title
type = reservoir
inflow = Bull Run River
outflow = Bull Run River
catchment = convert|3.5|mi2|km2|abbr=on
basin_countries = United States
length = convert|1.5|mi|km|abbr=on
width = convert|0.5|mi|km|abbr=on
area = convert|466|acre|km2|abbr=on
depth = convert|20|m|ft|abbr=on
max-depth = convert|70|m|ft|abbr=on
volume =
residence_time =
shore = convert|4.2|mi|km|abbr=on
elevation = convert|3162.8|ft|m (Oct.) to convert|3173.9|ft|m (May)
islands =
cities = (none)

Bull Run Lake is an artificial lake, an impoundment of the Bull Run River in the U.S. state of Oregon. It serves as the primary drinking water source for Portland, Oregon and rates highly as an oligotrophic lake, providing a very clean source of water.

The lake basin receives more than convert|110|in|cm of rain annually due to its location on the western slopes of Mount Hood. Public access to the area has been controlled since June 17,1892 with the creation of the Bull Run Reserve by President Benjamin Harrison. Water from the reservoir first flowed into the Portland water system on January 2,1895. President Theodore Roosevelt restricted entry to all but government agents and water company employees and banned stock grazing on April 28,1904.

In 1915 a new timber and rock fill dam raised the lake level about convert|10|ft|m. At least two series of efforts were made between 1917 and 1925 to decrease lake seepage. In 1961 additional areas of seepage were sealed with clay, and the outlet dam was remodeled to contain gates at elevations of convert|3147|ft|m and convert|3158|ft|m.

In 1994, concerns of outflow water temperature and its effect on fish populations led to regular careful measurements of the lake's thermocline characteristics and the inlet water temperature. Pier blocks were installed to minimize water temperature shock. cite web
url = http://www.oregonlakes.org/gallery/bull_run/bull_run.html
title = Bull Run Lake
work = Oregon Lakes Association
author = Roger Edwards
date = April 2002 ]

ee also

* List of lakes in Oregon

References