SPANAWAY LAKE -- PIERCE COUNTY: 1997

Lake Spanaway is located ten miles south of Tacoma, and 0.5 mile west of Spanaway. It is fed by drainage from a swampy area, and drains via Spanaway Creek to Clover Creek and Lake Steilacoom. Daron Island lies in the north portion of the lake

Size (acres)                         280
Maximum Depth (feet)                  28
Mean Depth (feet)                     16
Lake Volume (acre-feet)             4480
Drainage Area (square miles)       17.00
Altitude (feet)                      320
Shoreline Length (miles)             4.4

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 97/05/18 18.9 66.0 Lt Green 0 None Breezy 11.5 24.5 ALREADY A FAIR AMOUNT OF WEEDS REACHING THE SURFACE, ESPECIALLY ON THE SOUTH END. 97/05/31 18.3 64.9 Lt Green 50 None Light 15.0 48.0 97/06/15 21.1 70.0 Lt Green 75 None Light 11.5 0.0 97/06/29 18.9 66.0 Lt Green 75 Light Light 10.5 12.3 BEEN WET AND RAINY. LAKE COOLED DOWN AGAIN. 97/07/13 20.0 68.0 Lt Green 75 None Calm 9.5 0.5 97/07/26 23.3 73.9 Undefined 0 None Light 9.0 -0.5 WATER WAS A MODERATE GREEN COLOR. 97/08/10 23.3 73.9 Undefined 0 None Breezy 12.5 2.0 WATER WAS A MODERATE GREEN COLOR. 97/08/23 22.8 73.0 Undefined 100 Mod Calm 12.0 2.5 WATER WAS A MODERATE GREEN COLOR. 97/09/06 21.1 70.0 Undefined 10 None Breezy 12.5 2.0 WATER WAS A MODERATE GREEN COLOR. 97/09/21 17.8 64.0 7.0 Undefined 0 None Light 12.0 1.5 WATER WAS MODERATE GREEN. SEEONG MORE ALGAE EVERY WEEK. 97/10/04 15.6 60.1 6.5 Grn-brown 0 Heavy Breezy 9.5 1.5 FT. LEWIS HAD A TEARGAS SPILL INTO THE AIR ON SEPT. 23. THE WATER HAS DEFINITELY BECOME BROWNER AS A RESULT. THIS IS THE FIRST TIME THAT I HAVE BEEN ABLE TO SEE DEEPER DUE TO WATER COLOR?? 97/10/19 13.3 55.9 6.5 Grn-brown 0 Light Light 10.5 1.8 MORE ALGAE THAN LAST WEEK. ________________________________________________________________________________________________________________________
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 10J 97/05/28 H 20 97/09/05 E 14 0.28 6.4 97/09/05 H 93 0.85 STATION 2 97/05/28 E 9 97/09/05 E 14 ________________________________________________________________________________________________________________________ E=epilimnion composite, H=hypolimnion composite. Remarks codes: U = Below detection limits; J = Estimate.
SUMMARY OF VOLUNTEER SURVEY WATER QUALITY----------------------------------------------------------------------- Overall water quality was fair. The worst problems were reported as: 1. excessive aquatic plants 2. algae 3. decaying vegetation Sources of actual or potential problems includes: TOO MANY WATERFOWL. TOO MUCH ALGAE AND PLANT GROWTH FROM SEPTICS AND WATER FOWL. Were there days (and how many) when poor water quality impaired Fishing - YES(12) Swimming - YES(12) Aesthetics - YES(12) MANAGEMENT-------------------------------------------------------------------------- Did the lake receive chemical treatments this year? NO Were fish stocked this year? YES Any lake groups present (such as a lake association)? YES Any lake management activities this year? NO OTHER------------------------------------------------------------------------------- How many homes/new homes are there on the lake shore?~ 179 Changes since last year? NONE. Lake Uses and Facilities at the lake include: swimming fishing motor boating jet skiing picnic facilities parks The number of storm drains leading to the lake: 4 Motor boat restrictions include: 40 mph speed restrictionno wake restriction.
FIELD OBSERVATIONS OF ECOLOGY STAFF 5-28-97 Had volunteer calibrate Secchi line. There were very few zooplankton in the water samples, the least I've seen in this lake. The lake association has dissolved.
TROPHIC STATUS Estimated Trophic State: Meso-eutrophic Mean Trophic State Index (Secchi): 42 (Mesotrophic) Mean Trophic State Index (Total Phosphorus): 42 (Mesotrophic) Mean Trophic State Index (Chlorophyll a): 49 (Meso-eutrophic)
SUMMARY AND EXPLANATION OF TROPHIC STATE ASSESSMENT Spanaway Lake is a high use lake located in an urban area. TSI values alone might suggest a mesotrophic assessment but low summertime hypolimnetic DO concentrations, the abundant blue-green algae and significant macrophyte biomass, all support a meso-eutrophic assessment.
COMMENTS FROM 96/09/11 AQUATIC PLANT SURVEY partly cloudy, calm. Heavy native plant growth, tho' nice diverse community, mostly not surfacing. Lots of purple loosestrife in south part of lake. Cove at south end with weird purple sediment (later identified by Mike Crayton of PLU as Thiopedia), no plants in this cove - fine loose sediment, with a history of plant control. Many shallow areas of the lake with cobble bottom, no plants. Most of shoreline developed, many bulkheads. Maximum depth of plant growth: 4.5M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Ceratophyllum demersum (Coontail; hornwort) Chara sp. (muskwort) Elodea canadensis (common elodea) Elodea sp. (waterweed) Fontinalis antipyretica (water moss) Iris pseudacorus (yellow flag) Juncus sp. or Eleocharis sp. (small grass-like plants) Lemna minor (duckweed) Lythrum salicaria (purple loosestrife) Myosotis sp. (forget-me-not) Najas flexilis (common naiad) Nitella or Chara Nitella sp. (stonewort) Nuphar polysepala (spatter-dock, yellow water-lily) Nymphaea odorata (fragrant waterlily) Phalaris arundinacia (reed canarygrass) Potamogeton amplifolius (large-leaf pondweed) Potamogeton crispus (curly leaf pondweed) Potamogeton praelongus (whitestem pondweed) Potamogeton richardsonii (Richardson's pondweed) Potamogeton sp (thin leaved) (thin leaved pondweed) Potamogeton sp (thin leaved) or Heteranthera dubia (thin leaved pondweed-like) Potamogeton zosteriformis (eel-grass pondweed) Potentilla palustris (purple (marsh) cinquefoil) Scirpus sp. (bulrush) Tolypella intricata (macro algae) Typha sp. (cat-tail) Utricularia sp. (bladderwort) unknown plant (unknown)


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

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