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Size (acres) 278 Maximum Depth (feet) 30 Mean Depth (feet) 11 Lake Volume (acre-feet) 3058 Drainage Area (square miles) 1.44 Altitude (feet) 10 Shoreline Length (miles) 11.3
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 ________________________________________________________________________________________________________________________ STATION 1 97/07/17 21.7 71.0 Undefined 0 None Breezy 7.0 0.0 WATER WAS GREENISH-YELLOW. 97/07/30 21.1 70.0 Undefined 0 None Light 6.0 0.0 WATER WAS GREENISH BROWN TO YELLOW 97/08/13 21.1 70.0 Undefined 7 None Light 5.5 0.0 GREENISH-BROWN YELLOW 97/08/28 20.6 69.1 Grn-brown 75 Heavy Light 7.0 0.0 97/09/10 21.1 70.0 Grn-brown 100 None Light 7.0 0.0 97/09/24 20.0 68.0 Undefined 0 None Light 8.0 0.0 WATER COLOR WAS GREENISH-BROWN MIXED WITH YELLOW 97/10/11 14.4 57.9 Grn-brown 90 Heavy Light 4.0 0.0 LAST READING OF THE SEASON. STATION 2 97/07/02 21.7 71.0 Undefined 0 None Light 9.0 0.0 WATER WAS GREENISH-BROWN / YELLOW 97/07/17 21.7 71.0 Mod Green 0 None Breezy 9.0 0.0 97/07/30 21.1 70.0 Undefined 0 None Light 8.0 0.0 WATER WAS GREENISH -BROWN TO YELLOW. 97/08/28 20.6 69.1 Grn-brown 75 Heavy Light 6.0 0.0 97/09/24 20.0 68.0 Undefined 0 None Light 8.0 0.0 WATER WAS GREENISH-BROWN MIXED WITH YELLOW. 97/10/11 14.4 57.9 Grn-brown 75 Heavy Light 5.0 0.0 LAST READING OF THE SEASON. STATION 3 97/07/02 22.2 72.0 Mod Green 10 None Light 4.0 0.0 97/07/17 21.7 71.0 Mod Green 0 None Light 4.0 0.0 TIME IS APPROXIMATE. SAMPLERS DID NOT WRITE DOWN THE TIME . 97/07/30 21.1 70.0 Undefined 0 None Light 7.5B 0.0 WATER WAS GREENISH-BROWN TO YELLOW 97/08/13 Grn-brown 7 None Light 9.0 0.0 97/08/28 20.6 69.1 Grn-brown 90 Heavy Light 8.0B 0.0 97/09/10 21.1 70.0 Grn-brown 100 None Light 8.5B 0.0 97/09/24 20.0 68.0 Mod Green 0 None Light 7.5B 0.0 97/10/11 14.4 57.9 Grn-brown 75 Heavy Light 6.0 0.0 LAST READING OF THE SEASON. ________________________________________________________________________________________________________________________ B - Secchi disk hit bottom
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 97/06/16 E 54 0.25J 97/06/16 H 32 0.35J 97/08/21 E 20 0.27 8.0 97/08/21 H 30 0.74 ________________________________________________________________________________________________________________________ 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 Strong H2S odor in the hypolimnetic water. Lots of Brazilian elodea fragments observed.
TROPHIC STATUS Estimated Trophic State: Eutrophic Mean Trophic State Index (Secchi): 51 (Meso-eutrophic) Mean Trophic State Index (Total Phosphorus): 47 (Mesotrophic) Mean Trophic State Index (Chlorophyll a): 51 (Meso-eutrophic)
SUMMARY AND EXPLANATION OF TROPHIC STATE ASSESSMENT Duck Lake demonstrates many properties of an eutrophic lake. The lake is rich with macrophytes that line most of the shoreline and cover the majority of the sediment. This excessive biomass is not indicated in the trophic indicies which, in themselves, may suggest a meso-eutrophic assessment. Therefore, Duck Lake is assessed as eutrophic.
COMMENTS FROM 98/08/18 AQUATIC PLANT SURVEY Cloudy, light breeze. Egeria densa north of area around Overlake Rd much more dense. South lake with more algae growing on plants, fewer plants and murkier seeming water. Only quickly motored shoreline in most of Duck Lake proper, skipped the canals. Stopped over canal at Overlake Rd and did not see submersed plants growing. Maximum depth of plant growth: 3.5M.
AQUATIC PLANT LIST (This list may be from multiple years and sources.)Carex sp. (sedge) Cicuta douglasii (western water-hemlock) Egeria densa (Brazilian elodea) Elodea canadensis (common elodea) Hydrocotyle ranunculoides (water-pennywort) Iris pseudacorus (yellow flag) Juncus sp. (rush) Lythrum salicaria (purple loosestrife) Myriophyllum spicatum (Eurasian water-milfoil) Nuphar lutea (yellow water-lily) Nuphar polysepala (spatter-dock, yellow water-lily) Potamogeton epihydrus (ribbonleaf pondweed) Potamogeton pectinatus (sago pondweed) Potamogeton sp. (pondweed) Potentilla palustris (purple (marsh) cinquefoil) Solanum sp. (nightshade) Sparganium eurycarpum (broadfruited bur-reed) Spirodela polyrhiza (great duckweed) Typha sp. (cat-tail)
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