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HORSESHOE LAKE -- KITSAP COUNTY: 1997

Size (acres)                          40
Maximum Depth (feet)                  20
Mean Depth (feet)                     12
Lake Volume (acre-feet)              480
Drainage Area (square miles)        0.48
Altitude (feet)                      270
Shoreline Length (miles)             1.3

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
________________________________________________________________________________________________________________________
        STATION 1
97/05/11  19.0  66.2       Lt Green     10          Breezy 19.5B    0.0  MORE WEEDS THAN EVER BEFORE.
97/06/08  23.0  73.4       Lt Green     25   Mod    Breezy 16.5     0.0  
97/07/03  24.0  75.2       Mod Green     0   Trace  Breezy 10.0     0.0  
97/07/13  24.0  75.2       Mod Green     2   None   Calm   11.0     0.0  
97/07/27  26.0  78.8       Pea-green     0   None   Calm   13.0     0.0  CLOUDS OF GREEN SLIMY STUFF, NEVER SEEN BEFORE.
97/08/10  26.0  78.8       Mod Green     1   None   Light  11.5     0.0  LOTS OF CLEAR JELLY BLOBS ATTACHED TO AND BY
                                                                         DOCK, ALGAE IDENTIFIED AS GROENBELEIA NEGLECTA
97/08/30  25.0  77.0       Mod Green    10   Mod    Calm   10.0     0.0  ALGAE BLOOMS GONE THOUGH SOME ALGAE SITTING LIKE
                                                                         A LAYER ON THE BOTTOM OF THE LAKE.
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 B - Secchi disk hit bottom     
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)
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        STATION 1
97/06/19       E      22        0.29J                                                                            
97/06/19       H      13        0.24J                                                                            
97/09/12       E      10        0.21        6.0                                                                  
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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 1997.

FIELD OBSERVATIONS OF ECOLOGY STAFF
6-19-97  Lilies have been harvested several times this year and have a deep red color.
Some zooplankton observed.  Water level is very high.

TROPHIC STATUS
Estimated Trophic State:                                 Oligo-mesotrophic
Mean Trophic State Index (Secchi):                       39Y* (Oligo-mesotrophic)
Mean Trophic State Index (Total Phosphorus):             37 (Oligotrophic)
Mean Trophic State Index (Chlorophyll a):                48 (Meso-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
The water in Horseshoe Lake is very clear but the lake community appears to suffer
from excessive macrophyte growth in the shallow areas of the lake.  Although the
phosphorus concentrations and Secchi depths favor an oligotrophic assessment,
hypolimnetic DO concentrations, an elevated chlorophyll TSI and excessive macrophytes
suggest a more productive lake, therefore, Horseshoe Lake is assessed as
oligo-mesotrophic. 

COMMENTS FROM 96/08/22 AQUATIC PLANT SURVEY
Circumnavigated lake. Osprey, frogs.  Clear, breeze.  Popular recreational lake.
Mostly rocky bottom, lots of lilies, but not many submersed plants, homogenous
community.  Maximum depth of plant growth:  4.0M. 

AQUATIC PLANT LIST  (This list may be from multiple years and sources.)
Elodea nuttallii (Nuttall's waterweed)  Iris pseudacorus (yellow flag)  
Isoetes lacustris (lake quillwort)  Juncus sp. (rush)  Juncus sp. or
Eleocharis sp. (small grass-like plants)  Juncus supiniformis (spreading
rush)  Ludwigia palustris (water-purslane)  Nitella sp. (stonewort)  
Nymphaea odorata (fragrant waterlily)  Phalaris arundinacia (reed
canarygrass)  Potamogeton pusillus (slender pondweed)  Typha sp. 
(cat-tail)  Utricularia inflata (big floating 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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