State of the Lake 2009 - Tahoe Environmental Research Center ...

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Feet 6232 6230 6228 6226 6224 6222 TERC.UCDAVIS.EDU PHYSICAL PROPERTIES Lake surface level Daily since 1900 The lowest lake level on record was 6,220.26 feet on Nov. 30, 1992. Since 1900, lake level has varied by more than 10 feet. Lake level typically alternates between several years with values Natural rim 6223 feet Maximum legal limit 6229.1 feet 6220 Jan−1900 Jan−1920 Jan−1940 Jan−1960 Jan−1980 Jan−2000 TAHOE: STATE OF THE LAKE REPORT 2009 close to the maximum, then several years close to the natural rim. This pattern reflects climate wet and dry cycles in the western US. (Lake surface levels are recorded by the U.S. Geological Sur- vey as height above mean sea level. By law, Lake Tahoe cannot exceed 6,229.1 feet and nor can water be released to the Truckee River when it falls below the natural rim of 6,223 feet.) 8.1
Feet 6232 6230 6228 6226 6224 6222 TERC.UCDAVIS.EDU PHYSICAL PROPERTIES Lake surface level Daily since 2005 Lake surface level varies throughout the year. It rises due to high stream inflow, groundwater inflow and precipitation directly onto the lake. It falls due to evaporation, in-basin Natural rim 6223 feet TAHOE: STATE OF THE LAKE REPORT 2009 water withdrawals and flow out of the Truckee River. In 2008, dry conditions caused lake level to rise by only 10 inches during snowmelt, compared with several feet in normal runoff Maximum legal limit 6229.1 feet years. The highest lake level was 6225.48 feet on June 2, and the lowest was 6223.07 feet on December 19, less than 1 inch above the natural rim. 6220 Jan−2006 Jan−2007 Jan−2008 Jan−2009 8.2
Page 1 and 2: TAHOE: STATE OF THE LAKE REPORT 200
Page 3 and 4: INTRODUCTION The University of Cali
Page 5 and 6: EXECUTIVE SUMMARY (CONTINUED FROM P
Page 7 and 8: ABOUT LAKE TAHOE AND THE TAHOE BASI
Page 9 and 10: MAP OF TAHOE BASIN DATA COLLECTION
Page 11 and 12: Rainbow, Brook, Brown and Lake trou
Page 13 and 14: 100% 90% 80% 70% 60% 50% 40% 30% 20
Page 15 and 16: ASIAN CLAM Asian Clam Excretion Exp
Page 17 and 18: ASIAN CLAM Asian Clam Size Distribu
Page 19 and 20: Temperature ( o F) 60 55 50 35 30 M
Page 21 and 22: Temperature ( o F) 70 60 50 40 30 2
Page 23 and 24: Inches 70 60 50 40 30 20 10 0 METEO
Page 25 and 26: Percent 80 70 60 50 40 30 20 10 0 M
Page 27: PHYSICAL PROPERTIES TERC.UCDAVIS.ED
Page 31 and 32: Temperature ( o F) TERC.UCDAVIS.EDU
Page 33 and 34: Temperature ( o F) TERC.UCDAVIS.EDU
Page 35 and 36: Density Difference (kilograms per c
Page 37 and 38: Mean daily streamflow (cubic feet p
Page 39 and 40: NUTRIENTS AND PARTICLES TERC.UCDAVI
Page 41 and 42: TERC.UCDAVIS.EDU NUTRIENTS AND PART
Page 43 and 44: Metric Tons TERC.UCDAVIS.EDU 10 8 6
Page 45 and 46: Dissolved inorganic nitrogen (micro
Page 47 and 48: Nitrate−nitrogen (micrograms per
Page 49 and 50: BIOLOGY 10
Page 51 and 52: BIOLOGY Algae abundance Yearly sinc
Page 53 and 54: BIOLOGY Depth of chlorophyll maximu
Page 55 and 56: BIOLOGY TAHOE: STATE OF THE LAKE RE
Page 57 and 58: BIOLOGY Nutrient limitation of alga
Page 59 and 60: BIOLOGY Shoreline algae distributio
Page 61 and 62: TERC.UCDAVIS.EDU CLARITY Annual ave
Page 63 and 64: Depth (feet) TERC.UCDAVIS.EDU CLARI
Page 65: TERC.UCDAVIS.EDU OUTREACH AND EDUCA

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