Integrated snowpack samples and lakewater samples were collected from a low-alkalinity watershed in the North Cascades in 1984 and 1985 and analyzed for inorganic chemical parameters. Mean concentrations of NO 3-and SO, -2 from North Cascades snowpack were near 4.5 and 5.5 l•eq L -•, respectively. Mean pH was 5.2-5.3. During melting, anion levels in the snowpack decreased and pH increased. By July, mean NO 3 -and SO,,-2 concentrations were 0.32 and 1.73 #eq L-•, respectively, and mean pH was 5.48. Acid neutralizing capacity at the lake outlet during snowmelt was diluted to 50% of April premelt values. During snowmelt runoff there was no apparent neutralization of bicarbonate by strong acids. By comparing lakewater NO 3-concentrations to snowpack concentrations, over 75% of the NO 3 -in the lake could be attributed to a snowpack source. An estimated 30ø/,, of the SO, -2 in the lake was derived from the snowpack.A. Tollan, SNSF Project, Oslo, Norway, 1980. Chemistry of small Norwegian lakes with special reference to lake acidification, Limnol. Oceanogr., 23, 487-498, 1978.

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Thermal profile development, rates of heat uptake and annual heat budgets are presented for two monomictic lakes, Whatcom and Washington, in the Puget Sound lowlands of Washington State. The rates of heat gain in the lakes were found to be significantly affected by lake morphometry. In turn, the differing rates of heat gain affected the annual heat budgets.

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