Chemistry of Nutrient Sources as They Enter the Lake
Pathways followed by water and nutrients entering Lake Dillon can be divided for present purposes into six categories: (1) major rivers, (2) streams not joining a major river prior to reaching the lake, (3) sewage effluents, (4) miscellaneous surface drainage not accounted for in other categories, (5) precipitation, and (6) groundwater. All of these categories except miscellaneous surface drainage and groundwater, which made minor contributions, were studied chemically at or very near their point of entry to the lake. In the first category are the Snake River, the Blue River, and Tenmile Creek. These will take up most of the attention of this chapter, since they account for the bulk of surface transport to the lake. In the second category are Soda Creek and Miner’s Creek, both of which were sampled above the point sources that enter them near their mouths. In the third category are the effluents of the Frisco WWTP (which enters Miner’s Creek near the lake) and Snake River WWTP (which enters Soda Creek near the lake). Both of these effluents were sampled prior to entering streams. Breckenridge effluent was part of the Blue River sample, since the effluent enters above the river mouth, and Copper Mountain effluent was part of the Tenmile Creek sample for the same reason. Discharge data for rivers were obtained from USGS data records. For the effluents, discharge data were obtained from plant operators, and for Miner’s Creek and Soda Creek the data were based on our own measurements. All chemistry data were from our own analyses.
KeywordsParticulate Phosphorus Bulk Precipitation Particulate Nitrogen Stream Chemistry WWTP Effluent
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