Summit Lake is located in a steep forested valley nine miles west of Olympia. It is two miles long. Summit Lake is fed by intermittent streams, seeps, and springs, and drains via Kennedy Creek to Oyster Bay in Totten Inlet.

Size (acres)                         530
Maximum Depth (feet)                 100
Mean Depth (feet)                     53
Lake Volume (acre-feet)            28090
Drainage Area (square miles)        2.82
Altitude (feet)                      500
Shoreline Length (miles)             5.6

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 97/06/24 15.6 60.1 Lt Green 25 Light Light 23.0 0.0 97/08/05 20.6 69.1 Lt Green 0 None Calm 25.0 0.0 97/08/28 18.9 66.0 6.5 Lt Green 50 Calm 25.0 0.0 97/09/09 18.9 66.0 6.5 Lt Green 0 None Light 25.0 0.0 97/09/21 15.6 60.1 6.5 Lt Green 0 None Light 25.0 6.0 2 INCHES OF RAIN LAST WEEK. 97/10/06 13.3 55.9 6.0 Lt Green 50 Mod Calm 25.0 0.0 THURSTON CO. SAYS THAT THERE IS A SMALL SPOT OF MILFOIL. ________________________________________________________________________________________________________________________
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) ________________________________________________________________________________________________________________________ There are no LWQA Program chemistry data for this lake in 1997. ________________________________________________________________________________________________________________________
SUMMARY OF VOLUNTEER SURVEY There was no survey response for 1997. FIELD OBSERVATIONS OF ECOLOGY STAFF 8-28-97 pH paper = 6.5. The lake shore is almost entirely built out. Homes are now being built in the watershed away from the shore but the water supply is still coming from the lake. There is very little natural shoreline. Very few newts observed in the water. Lots of mussel shells observed. 2/3 rds of the residents drink lake water.
TROPHIC STATUS Estimated Trophic State: Oligotrophic Mean Trophic State Index (Secchi): 31 (Oligotrophic) Mean Trophic State Index (Total Phosphorus): 0 (Not assessed) Mean Trophic State Index (Chlorophyll a): 0 (Not assessed)
SUMMARY AND EXPLANATION OF TROPHIC STATE ASSESSMENT Summit Lake remains one of the clearest lakes in Thurston County. TSI values and hypolimnetic DO concentrations support the oligotrophic assessment. It's interesting to note that mid-summer hypolimnion DO concentrations remain favorable even near the deep site sediment. TP and Chlorophyll TSI information along with DO profile information was provided by Thurston County Environmental Health.
COMMENTS FROM 97/07/23 AQUATIC PLANT SURVEY sunny, light breeze. freshwater mussels. Band of mostly bare sediment outside floating leaf community, deeper water mostly with P. amplifolius and P. robbinsii. Nice clear water, low growing plant community for the most part. Sediment mostly sand / gravel. John snorkled from boat launch around west end. Maximum depth of plant growth: 7.0M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Brasenia schreberi (watershield) Chara sp. (muskwort) Elodea canadensis (common elodea) Isoetes sp. (quillwort) Juncus sp. or Eleocharis sp. (small grass-like plants) Potamogeton amplifolius (large-leaf pondweed) Potamogeton foliosus (leafy pondweed) Potamogeton robbinsii (fern leaf pondweed) Utricularia sp. (bladderwort)

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

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