BLACK LAKE -- THURSTON COUNTY: 1994

Black Lake is located four miles southwest of Olympia. It is 2.5 miles long. The lake is fed by two unnamed perennial tributaries, and drains via Percival Creek to Budd Inlet. Black Lake was monitored by Ecology staff only.

Size (acres)                         570
Maximum Depth (feet)                  29
Mean Depth (feet)                     19
Lake Volume (acre-feet)            10830
Drainage Area (square miles)       10.10
Altitude (feet)                      131
Shoreline Length (miles)             6.0

Contour Map

Source of morphometric data: Water Supply Bulletins 42, 43, and 57.


VOLUNTEER-COLLECTED SECCHI DATA
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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.

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LABORATORY RESULTS
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                    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
94/06/03       E      44        0.18        7.0                                                                  
94/06/03       H      52        0.21                                                                             
94/08/29       E      42        0.47J      19.1J           7       100        2.0                                
94/08/29       H     230        0.76J                                                                            
        STATION 2
94/06/03       E      34        0.24                                                                             
94/08/29       E      27        0.45J                                                                            
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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 BLACK (THURSTON) in 1994


TROPHIC STATUS
Estimated Trophic State:                                 Eutrophic
Mean Trophic State Index (Secchi):                       0 (Not assessed)
Mean Trophic State Index (Total Phosphorus):             55 (Eutrophic)
Mean Trophic State Index (Chlorophyll a):                56J* (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

No summary analysis was performed for BLACK (THURSTON) in 1994


COMMENTS FROM 95/04/18 AQUATIC PLANT SURVEY
visited to test a sediment corer borrowed from the UW.  Very few submersed plants
growing yet.

AQUATIC PLANT LIST  (This list may be from multiple years and sources.)
Ceratophyllum demersum (Coontail; hornwort)  Elodea canadensis (common
elodea)  Equisetum sp. (horse tail)  Iris pseudacorus (yellow flag)  
Najas flexilis (common naiad)  Nitella sp. (stonewort)  Nuphar
polysepala (spatter-dock, yellow water-lily)  Nymphaea odorata (fragrant
waterlily)  Phalaris arundinacia (reed canarygrass)  Potamogeton
amplifolius (large-leaf pondweed)  Potamogeton epihydrus (ribbonleaf
pondweed)  Potamogeton richardsonii (Richardson's pondweed)  Potamogeton sp
(thin leaved) (thin leaved pondweed)  Typha sp. (cat-tail)

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

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