Croft Lake (Coos)

Reachcode: 17100306000356 | Area: 60.1 acres | Shoreline: 1.9 mi | View on Interactive Map

(From Atlas of Oregon Lakes, Johnson et al. 1985). Croft Lake is a small natural lake on the southern Oregon coast and was, at one time, known as Crooks Lake. Its origin is similar to many others in the immediate area, for example New Lake immediately to the south. The circular lake basin lies in a shallow sag in a low marine terrace and was filled with water when the flow of Davis Creek was impounded by the build-up of sand dunes across its course. It is a relatively shallow lake and the water surface is barely above sea level. Extensive areas on the northern and southern ends are less than five feet deep. Much of the surrounding area is low marshland and during the wet periods in the winter the lake will expand to cover a surface area two or three times its normal summer level. Davis Creek is the primary surface inflow; the outflow at the northwest end wanders through the dunes to New River, which drains to the Pacific. Croft Lake is private and access is restricted. It is used primarily by local residents for swimming, boating and bass fishing.

The water in this shallow lake has a distinct greenish cast to it, a color due in part to the abundant growth of submerged macrophytes. The presence of algae and the turbidity may also contribute to the color. Strong winds prevent any stratification in the lake and keep it well-mixed and relatively turbid. Water in the lake has relatively low concentrations of chemical constituents, although it is influenced by sea spray. There are several private homes on the north shore and recreational use may contribute somewhat to nutrient enrichment. However, the concentration of phosphorus is about average for coastal lakes and the chlorophyl concentration is low, suggesting conditions at the lower end of mesotrophy. The lake is clear enough that a Secchi disk is visible on the bottom at the sample site, a depth of 11.5 feet (3.5 meters).