Lake Penland (Morrow)
Reachcode: 17070202001525 | Area: 61.9 acres | Shoreline: 1.7 mi | View on Interactive Map
(From Atlas of Oregon Lakes, Johnson et al. 1985) Penland Lake is an artificial lake on private land within the Umatilla National Forest boundaries; however, there is public access. The lake was built about 1960 by local interests to serve strictly as a recreation site, and water is not withdrawn for other purposes. The lake is stocked quite heavily with rainbow trout and has proven to be a successful enterprise for local anglers. A good launching site is located at the lake as well as a Forest Service campground. Cutsforth Dam, a 29-foot earthfill structure, impounds the flow of Mallory Creek to submerge a portion of Penland Prairie. There is an additional small dike along the west side of the lake. Outflow into Mallory Creek joins the John Day River about 10 miles downstream. The small drainage basin is a forested area of low relief.
Penland Lake is very shallow, with a mean depth of about eight feet; maximum depth is only 24 feet when full. Macrophytes have encroached on the-lake in shallow areas around much of the shoreline. Alkalinity, conductivity, and concentrations of major ions are moderate for lakes in eastern Oregon, while water transparency, and chlorophyl and phosphorus concentrations are about average and imply a mesotrophic lake. However, the surface water pH (8.0) and the dissolved oxygen depletion in the hypolimnion indicate that Penland Lake may be at the higher end of mesotrophic.