LOON LAKE -- STEVENS COUNTY: 1997

Size (acres)                        1100
Maximum Depth (feet)                 100
Mean Depth (feet)                     46
Lake Volume (acre-feet)            50600
Drainage Area (square miles)       14.10
Altitude (feet)                     2381
Shoreline Length (miles)             7.9

Contour Map

Source of morphometric data: Water Supply Bulletins 42, 43, and 57.


VOLUNTEER-COLLECTED SECCHI DATA ________________________________________________________________________________________________________________________ Date Temperature Water %Cloud Recent Secchi Lake (Y/M/D) (C) (F) pH Color Cover Rain Wind (ft) Ht(in) Abbrev. Comments ________________________________________________________________________________________________________________________ STATION 1 97/06/07 17.0 62.6 Lt Green 0 None Light 26.0 0.0 LAKE AT HIGH WATER MARK. TRUE ELEVATION OF THE LAKE IS 2381.525 FEET 97/06/25 18.0 64.4 Lt Green 10 Trace Light 23.0 0.0 LAKE IS TURNING OVER. WATER LEVEL AT 2381 FT. 3.2 INCHES. 97/07/08 18.1 64.6 Lt Green 25 None Breezy 21.0 0.0 WATER LEVEL AT 2381' 2.2" 97/07/19 21.1 70.0 Lt Green 0 None Calm 22.0 0.0 WATER LEVEL WAS 2381.8 FEET ABOVE SEA LEVEL. 97/08/01 23.9 75.0 Lt Green 10 None Light 24.0 0.0 97/08/16 6.0 Lt Green 0 Mod Strong 23.5 0.0 WATER LEVEL WAS 2380.54 FEET ABOVE SEA LEVEL. 97/09/06 20.6 69.1 Lt Green 10 None Light 22.0 4.7 97/09/19 17.8 64.0 Lt Green 10 Heavy Calm 23.0 0.0 WATER WAS AT 2380.42 FEET ABOVE SEA LEVEL. 97/10/10 Lt Green 50 Light Calm 20.0 0.0 WATER WAS AT 2380 FEET 4.2 INCHES ABOVE SEA LEVEL. LAST TEST FOR THE SEASON. ________________________________________________________________________________________________________________________
LABORATORY RESULTS ________________________________________________________________________________________________________________________ Total Total Fecal Col. Bacteria Turb- Suspended Solids Phosphorus Nitrogen Chlorophyll (colonies/100 mL) idity Total Non-Volatile Color Date Strata (ug/L) (mg/L) (ug/L) Site 1 Site 2 (NTU) (mg/L) (mg/L) (Pt-Co) ________________________________________________________________________________________________________________________ STATION 1 97/05/28 E 9 0.31 97/05/28 H 11 0.37 97/08/25 E 6 1.3J 1 3 97/08/25 H 16 ________________________________________________________________________________________________________________________ E=epilimnion composite, H=hypolimnion composite. Remarks codes: U = Below detection limits; J = Estimate.
SUMMARY OF VOLUNTEER SURVEY WATER QUALITY----------------------------------------------------------------------- Overall water quality was excellent. The worst problems were reported as: 1. algae 2. algae 3. excessive aquatic plants Sources of actual or potential problems includes: TRHE DISCOVERY OF MILFOIL AROUND THE LAKE. Were there days (and how many) when poor water quality impaired Fishing - NO(0) Swimming - NO(0) Aesthetics - NO(0) MANAGEMENT-------------------------------------------------------------------------- Did the lake receive chemical treatments this year? YES Were fish stocked this year? NO Any lake groups present (such as a lake association)? YES Any lake management activities this year? YES OTHER------------------------------------------------------------------------------- How many homes/new homes are there on the lake shore?~ 486 Changes since last year? NONE Lake Uses and Facilities at the lake include: swimming fishing motor boating jet skiing camping picnic facilities The percent of the lakeshore that is sewered: 100 The number of storm drains leading to the lake: 3 Motor boat restrictions include: 50 mph speed restrictionno wake restriction no restrictions.
FIELD OBSERVATIONS OF ECOLOGY STAFF Milfoil seen at volunteers dock and also at a private dock on the road side of the lake. Lots of rain and cooler prior to summer sample.
TROPHIC STATUS Estimated Trophic State: Oligo-mesotrophic Mean Trophic State Index (Secchi): 32 (Oligotrophic) Mean Trophic State Index (Total Phosphorus): 30 (Oligotrophic) Mean Trophic State Index (Chlorophyll a): 33J* (Oligotrophic) *The calculated TSI is an estimate. The Secchi disk hit bottom (B), entered the weeds (W), or there were too few valid readings (N), or the calculation was based on qualified data (J), or TSIP was based on spring data (S).
SUMMARY AND EXPLANATION OF TROPHIC STATE ASSESSMENT All of the TSI values suggest an oligotrophic assessment for Loon Lake, however, low DO concentrations in the summertime hypolimnion suggest a more eutrophic assessment.
COMMENTS FROM 98/08/11 AQUATIC PLANT SURVEY Sunny, breeze. Treated M. spicatum patches with 2,4-D after July 4th (the 6th?). The Nuphar and Brasenia have curled leaves, thought looking like they will grow out of it. Megalodonta and M. sibiricum with clumped growing tips, non-dividing leaves. M. spicatum reduced, but still many healthy plants in some areas, knocked over and covered with sediment, but green beneath, looks like they will survive. Maximum depth of plant growth: 6.7M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Brasenia schreberi (watershield) Ceratophyllum demersum (Coontail; hornwort) Ceratophyllum sp. (coontail) Chara sp. (muskwort) Eleocharis sp. (spike-rush) Elodea canadensis (common elodea) Fontinalaceae (aquatic moss) Heteranthera dubia (water star-grass) Iris pseudacorus (yellow flag) Isoetes sp. (quillwort) Juncus sp. or Eleocharis sp. (small grass-like plants) Lysimachia vulgaris (garden loosestrife) Lythrum salicaria (purple loosestrife) Megalodonta beckii (water marigold) Myriophyllum sibiricum (northern watermilfoil) Myriophyllum sp. (water-milfoil) Myriophyllum spicatum (Eurasian water-milfoil) Najas flexilis (common naiad) Nuphar polysepala (spatter-dock, yellow water-lily) Nymphaea odorata (fragrant waterlily) Phalaris arundinacia (reed canarygrass) Polygonum amphibium (water smartweed) Potamogeton amplifolius (large-leaf pondweed) Potamogeton gramineus (grass-leaved pondweed) Potamogeton illinoensis (Illinois pondweed) Potamogeton natans (floating leaf pondweed) Potamogeton pectinatus (sago pondweed) Potamogeton praelongus (whitestem pondweed) Potamogeton richardsonii (Richardson's pondweed) Potamogeton robbinsii (fern leaf pondweed) Potamogeton sp (thin leaved) (thin leaved pondweed) Potamogeton sp. (pondweed) Potamogeton zosteriformis (eel-grass pondweed) Potentilla palustris (purple (marsh) cinquefoil) Ranunculus aquatilis (water-buttercup) Scirpus sp. (bulrush) Typha sp. (cat-tail) Utricularia sp. (bladderwort) Vallisneria americana (water celery)


Data collected and provided by Washington Department of Ecology's Lake Monitoring Program (Maggie Bell-McKinnon, phone 360-407-6124).

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