VANCOUVER LAKE -- CLARK COUNTY: 1995

Size (acres)                        2858
Maximum Depth (feet)                   0
Mean Depth (feet)                      0
Lake Volume (acre-feet)                0
Drainage Area (square miles)    N/A     
Altitude (feet)                        9
Shoreline Length (miles)             0.0

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 95/05/30 Lt Brown 0 2.0 0.0 ________________________________________________________________________________________________________________________

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 95/05/30 E 75 0.61 35.8 24 2 3.9 95/05/30 H 95/09/14 E 212 0.74 29.6 1 5 STATION 2 95/09/14 H 257 ________________________________________________________________________________________________________________________ E=epilimnion composite, H=hypolimnion composite. Remarks codes: U = Below detection limits; J = Estimate.

SUMMARY OF VOLUNTEER SURVEY There was no survey response for 1995. FIELD OBSERVATIONS OF ECOLOGY STAFF Pondweed (Potamogeton crispus) was observed growing near the center of the lake. Heavy algal growth was observed during the summer visit.

TROPHIC STATUS Estimated Trophic State: Eutrophic Mean Trophic State Index (Secchi): 68N* (Eutrophic) Mean Trophic State Index (Total Phosphorus): 81 (Eutrophic) Mean Trophic State Index (Chlorophyll a): 65 (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 Vancouver Lake is classified as hyper-eutrophic. It has extraordinarily high phosphorus concentrations with corresponding abundant algal growth and poor water clarity. The lake is also very shallow with excessive vegetation.

COMMENTS FROM 95/08/15 AQUATIC PLANT SURVEY no plants observed, only walked shore at the inflow dilution canal, and the county park

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

Go To: