LENORE LAKE -- GRANT COUNTY: 1997

Size (acres)                        1300
Maximum Depth (feet)                  27
Mean Depth (feet)                     15
Lake Volume (acre-feet)            19500
Drainage Area (square miles)      367.00
Altitude (feet)                     1075
Shoreline Length (miles)            14.4

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 97/05/21 0 13.5 0.0 ALGAE COLONIES VISIBLE. WATER LEVEL IS DOWN 1-2 FEET. LOTS OF COPEPODS IN 2 TO 4 METERS. A FEW LARGE DAPHNIA AT 6 METERS 97/05/21 0 None Calm 13.5 0.0 ________________________________________________________________________________________________________________________
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 97/05/22 E 59 0.74 97/08/19 E 59 0.94 13.7 3.0 ________________________________________________________________________________________________________________________ E=epilimnion composite, H=hypolimnion composite. Remarks codes: U = Below detection limits; J = Estimate.
SUMMARY OF VOLUNTEER SURVEY There was no survey response for 1997. FIELD OBSERVATIONS OF ECOLOGY STAFF In spring: algae colonies were visible; water level was ~1-2 ft below deposited salts on the shoreline. Many small green-red copepods in 2 and 4M casts; a few large Daphnia at 6M. Not stratified at summer sampling; algae bloom evident; many cladocerans and copepods in samples.
TROPHIC STATUS Estimated Trophic State: Meso-eutrophic Mean Trophic State Index (Secchi): 40N* (Oligo-mesotrophic) Mean Trophic State Index (Total Phosphorus): 63 (Eutrophic) Mean Trophic State Index (Chlorophyll a): 56 (Eutrophic) *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 Although there weren't enough Secchi dips to make an accurate Secchi TSI, all other indicators suggest a very productive lake. DO concentrations in the summertime hypolimnion are not indicative of an eutrophic lake, therefore, an assessment of meso-eutrophic is justified.
COMMENTS FROM 96/07/17 AQUATIC PLANT SURVEY sunny, calm at first then got really WINDY so did not do boat survey on south 1/3 of lake, looked from shore there. No plants in shallows unless in a protected area. Thick Ruppia in deeper water. Water level fluctuates from pumping, appears low now. Algae on plants thick. Alkalinity 138 mg/l carbonate, 503 mg/l bicarbonate. 741 mg/l total. Maximum depth of plant growth: 2.0M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Potamogeton pectinatus (sago pondweed) Potamogeton sp (thin leaved) (thin leaved pondweed) Ruppia maritima (ditch-grass) Scirpus acutus (hardstem bulrush) Scirpus americanus (american bulrush) Scirpus maritimus (seacoast bulrush)


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

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