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Roesiger is located 8.5 miles northeast of Monroe. The north and south basins of the lake are separated by a shallow connecting basin. The volunteer monitored both basins. The north basin of Lake Roesiger is fed by an intermittent stream, and drains southeast through the south basin of the lake via Roesiger Creek to Woods Creek and the Skykomish River.
Size (acres) 200 Maximum Depth (feet) 110 Mean Depth (feet) 48 Lake Volume (acre-feet) 9600 Drainage Area (square miles) 1.95 Altitude (feet) 570 Shoreline Length (miles) 2.9
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 97/04/26 12.5 54.5 7.0 Lt Green 100 Trace Calm 18.0 10.0 97/05/18 20.0 68.0 7.0 Lt Green 25 Trace Calm 20.0 13.5 97/07/13 20.0 68.0 7.0 Lt Green 2 None Calm 16.0 0.0 97/09/11 100 Trace Light 19.8 0.0 97/09/21 19.5 67.1 6.0 Mod Green 0 None Calm 18.0 15.0 LEAF DEBRIS FLOATING IN THE MIDDLE OF THE LAKE. ________________________________________________________________________________________________________________________
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 97/06/03 E 3 97/06/03 H 5 97/09/11 E 4 0.11 3.6 97/09/11 H 19 0.38 ________________________________________________________________________________________________________________________ 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 Very few algal cells observed in the water samples--some blue-greens present.
TROPHIC STATUS Estimated Trophic State: Oligotrophic Mean Trophic State Index (Secchi): 35 (Oligotrophic) Mean Trophic State Index (Total Phosphorus): 23 (Oligotrophic) Mean Trophic State Index (Chlorophyll a): 43 (Mesotrophic)
SUMMARY AND EXPLANATION OF TROPHIC STATE ASSESSMENT Data collected from Lake Roesiger (North Arm) in 1997 support an oligotrophic assessment.
COMMENTS FROM 98/08/06 AQUATIC PLANT SURVEY sampled along with south part of lake, found M. spicatum
AQUATIC PLANT LIST (This list may be from multiple years and sources.) Elodea canadensis (common elodea) Iris pseudacorus (yellow flag) Lythrum salicaria (purple loosestrife) Myriophyllum spicatum (Eurasian water-milfoil) Phalaris arundinacia (reed canarygrass) Potamogeton pusillus (slender pondweed) Sagittaria graminea (slender arrowhead) Vallisneria americana (water celery)
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