Results obtained through the Watershed
Watch program of the Rideau Valley
Conservation Authority are tabulated below.
In most years, five points on the lake (sites A,
B, F, G, and the deep point (DP) on the
adjacent map) are sampled for two chemical
parameters and E. coli contamination. In
addition at the deep point, dissolved
oxygen/temperature profiles are obtained in
order to assess lake trout habitat. Such
testing occurs three to four times each season
from May until September.
At five year intervals, seven other shoreline
sites are tested (green dots and additional red
dots). This is being done in 2017.
Rideau Valley Conservation Authority continues to be an exceptional steward of their
watershed, which includes Eagle Lake. Each season since 2002, as part of their
Watershed Watch program, staff visit the lake on four occasions to collect water
samples for analysis, as well as to measure dissolved oxygen and temperature profiles
at the deep point of Eagle Lake. For the latter testing, Larry Cameron provides his
pontoon boat on each occasion.
To provide a preliminary assessment of current water quality for property owners,
data for samples obtained in May, July and August were requested. Generally at Eagle
Lake, water samples are collected at four shoreline sites as well as at the deep point.
Every five years, however, samples are collected at seven additional shoreline sites to
provide a more generalized evaluation of water conditions.
E. coli concentrations are one of the prime concerns, but fortunately, all 22 samples
for the current season are completely negative.
Water samples for total phosphorus and total nitrogen are also evaluated.
Unfortunately, it appears that the results for the August sampling are unreliable
apparently due to a technical problem at the laboratory and, if the samples are still
available, RVCA staff will ask to have these retested. For the 13 samples obtained in
May and July, the average results for total phosphorus of 6.8 micrograms per litre
and for total nitrogen of 257 micrograms per litre are both excellent and below the
average results for the years 2002 to 2014 (total phosphorus 8.9 micrograms per
litre and total nitrogen 323 micrograms per litre, respectively).
The single test result for calcium concentration of 15.4 micrograms per litre is also
favourable and below the level usually required for zebra mussels to become
established (need calcium levels above 20 micrograms per litre for shell
In the winter newsletter, an update of all of this seasonís water quality data will be
Water Quality at Eagle Lake;
A preliminary Report for 2017