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10 percent between the May and lune sampling dates probably was caused by dilution from inflowing water. Between the May and lune sampling dates, water from the Colorado Canal (fig. I) was diverted into the lake. On May I. the mean specific conductance in the lake was 995 ).IS/cm. On lune 29, the specific conductance measured at site HI was 468 ).IS/cm (table 3). and the mean specific conductance for the lake had decreased to 896 ).IS/cm. On August 19, the mean specific con- ductance in the lake had increased to 974 ).IS/cm. The specific conductance in Lake Henry increased again between the August and October sampling dates. On October 6. there was no inflow to the lake; the lack of inflow combined with a large concentration of dis- solved solids due to evaporation may account for the larger specific conductance measured on October 6. In general. Secchi-disk depths were unifonn throughout the lake. On May I, the Secchi-disk mea- surements were 1.5 ft at all sites except site HEW3. which was 0.5 ft. On the other sampling dates, the Secchi-disk measurements were 0.5 ft at all sites (table 4). Light transparency in Lake Henry probably is most affected by phytoplankton biomass; however. suspended sediments from the inflow and disturbed bottom sediments from wave action also could decrease light transparency. Table 3. Onsite measurements at the Lake Henry inlet (HI) and the Sugar City lateral (HO) [OC, degrees Celsius; mgIL. milligrams per Liter; IlS/cm, microsiemens percentimeler at 25 degrees Celsius; dashes indicate no measurement} Sampling data, Water Dissolved oxygen Specific temperature pH conductance 1987 (OC) (mgIL) (~S1cm) 05-01 06-29 20.6 7.0 8.1 468 08-19 27.0 5.1 8.2 57\ 10-06 05-01 \9.2 7.8 8.3 1.000 06-29 22.9 6.8 8.3 879 08-\9 21.6 6.4 8.4 980 10-06 16.2 8.2 8.5 996 Sampling site (fig. 2) HI HO 14 Reconnaissance of Water Quality 01 Lake Henry and Lake Meredith ReaBrYolr, Crowley County, Southeastern Colorado, April-October 1987