Lake Sacheen is located about 34 miles north of Spokane, and 12 miles west of Newport. It is two miles long. Principal inlets include Moon and Star Creeks. It drains via the West Branch of the Little Spokane River. There is a low dam at the outlet, built in 1922. Lake Sacheen was monitored by Ecology staff only.
Size (acres) 317 Maximum Depth (feet) 40 Mean Depth (feet) 24 Lake Volume (acre-feet) 7608 Drainage Area (square miles) 42.80 Altitude (feet) 2234 Shoreline Length (miles) 6.3
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 ________________________________________________________________________________________________________________________ There are no Secchi data available for 1994. ________________________________________________________________________________________________________________________
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 94/05/20 E 19 0.16 3.1 94/05/20 H 50 0.21 94/08/19 E 30 0.25J 1.0J 94/08/19 H 82 0.41J ________________________________________________________________________________________________________________________ E=epilimnion composite, H=hypolimnion composite. Remarks codes: U = Below detection limits; J = Estimate.
SUMMARY OF VOLUNTEER SURVEY There was no survey response for 1994. FIELD OBSERVATIONS OF ECOLOGY STAFF There were no field observations recorded for SACHEEN (PEND OREILLE) in 1994
TROPHIC STATUS Estimated Trophic State: Not Available Mean Trophic State Index (Secchi): 0 (Not assessed) Mean Trophic State Index (Total Phosphorus): 53 (Eutrophic) Mean Trophic State Index (Chlorophyll a): 38J* (Oligo-mesotrophic) *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 No summary analysis was performed for SACHEEN (PEND OREILLE) in 1994
COMMENTS FROM 94/08/02 AQUATIC PLANT SURVEY sunny breezy, thick patches of M. spicatum and pondweeds throughout littoral zone. Found beetles and Chironomidae on a few plants. Much of the M. spicatum had a strange growth form, reportedly the result of the harvester. motored through most of the shoreline Maximum depth of plant growth: 4.5M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Brasenia schreberi (watershield) Callitriche heterophylla (different-leaved water-starwort) Ceratophyllum demersum (Coontail; hornwort) Chara sp. (muskwort) Elodea canadensis (common elodea) Juncus sp. or Eleocharis sp. (small grass-like plants) Lemna minor (duckweed) Lythrum salicaria (purple loosestrife) Myriophyllum sp. (water-milfoil) Myriophyllum spicatum (Eurasian water-milfoil) Nuphar polysepala (spatter-dock, yellow water-lily) Nymphaea odorata (fragrant waterlily) Potamogeton amplifolius (large-leaf pondweed) Potamogeton diversifolius (snailseed pondweed, diverse leaf pondweed) Potamogeton illinoensis (Illinois pondweed) Potamogeton pectinatus (sago pondweed) Potamogeton praelongus (whitestem pondweed) Potamogeton pusillus (slender pondweed) Potamogeton robbinsii (fern leaf pondweed) Potamogeton zosteriformis (eel-grass pondweed) Scirpus sp. (bulrush) Typha sp. (cat-tail)
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