Bobby Lake (Deschutes)
Reachcode: 17070301000913 | Area: 79.5 acres | Shoreline: 2.4 mi | View on Interactive Map
(From Atlas of Oregon Lakes, Johnson et al. 1985). Bobby Lake is located immediately east of the Cascade Mountains divide at an elevation of 5408 feet above sea level. Although it is located in the headwaters of the Deschutes River Basin, the closest access point is from Waldo Lake Road in the Willamette River Basin. The lake lies in a rugged area of volcanic terrain that was also affected by glaciation during the Pleistocene Epoch. Most of the runoff in this region is subsurface through permeable volcanic material. No surface streams enter the lake, and the outlet stream, Moore Creek, is intermittent. Vegetation in the drainage basin is a dense coniferous forest, typical of the High Cascades at this elevation. The lake is accessible only by trail and does not receive very heavy recreational use. However, fishing is consistently good; eastern brook trout are taken occasionally up to 16 inches, and it is a good fly-fishing lake with lots of shallow water.
The shape of the lake is irregular and consists of several small interconnected basins of very different morphology. The upper, or western, end has a larger surface area, and contains the deepest basin in the lake, reaching a maximum depth of nearly 60 feet. The eastern end of the lake includes a smaller and somewhat shallower basin, and, near the outlet has an elongate and very shallow bay. The water column develops a distinct thermal stratification with a thermocline at a depth of about 20 to 26 feet (6 to 8 meters). A few submerged macrophytes develop in shallower areas, particularly in the shallow bays. The water in the lake is very low in chemical constituents; the concentrations of ions and the alkalinity and conductivity are less than in most Oregon lakes, but are typical of other high elevation lakes in the Cascades. The concentrations of phosphorus and chlorophyl are very low, and water transparency is excellent. Bobby Lake is very oligotrophic, nearly ultraoligotrophic, and has very little biological productivity.