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<br />. <br /> <br />March. Weather conditions at the dam would limit construction <br /> <br /> <br />activities to the period of May through mid-November. Precautions <br /> <br /> <br />would be required to protect fresh concrete from freezing tempera- <br /> <br /> <br />tures during much of the construction season. <br /> <br /> <br />No weather stations or snow course stations are located within <br /> <br /> <br />the drainage basin above Rio Grande Reservoir. Extremely severe <br /> <br /> <br />winter weather conditions would occur at the higher elevations along <br /> <br /> <br />the Continental Divide. A snow pack moisture content of 50 inches <br /> <br /> <br />or more could occur at higher elevations. <br /> <br />. <br /> <br />Water Qua I i ty <br />Very little water quality information is available for the Rio <br />Grande headwaters. limited specific conductance measurements of the <br />Rio Grande at Wagon Wheel Gap indicate that dissolved solids concen- <br />trations are on the order of 100 mg/l. Since there is no significant <br />human impact on the drainage basin above Rio Grande Reservoir, it is <br />believed that the water quality at the reservoir is of excellent <br />quality, with a high dissolved oxygen concentration and a very low <br />concentration of dissolved solids. The reservoir inflow has a fairly <br />high turbidity during the snowmelt season and after heavy summer rain- <br />storms. Based on measurements in other undeveloped basins, spring <br />runoff turbidity may reach 10 to 30 units. Turbidity during the <br />remainder of the year is probably much less than one unit. <br /> <br />. <br /> <br />-18- <br />