Rainbow Lake is a 116-acre manmade lake near the town of Pinetop-Lakeside in southern Navajo County, Arizona, United States. The lake was created in 1903 when Mormon settlers dammed Walnut Creek, a tributary of the Little Colorado River, to impound water for irrigation. History Settlers established communities in nearby Lakeside and Pinetop in the early 1880s. These settlements eventually grew into a single larger community called Lakeside, incorporated in 1986 as the Town of Pinetop-Lakeside. Rainbow Lake was originally built as a reservoir for the Pinetop-Woodland Lake Irrigation Company, who own all the water in the lake used for irrigation purposes. Water levels in the lake vary widely, depending on the season, precipitation, and the needs of the irrigation company. In 1998, the Show Low Irrigation Company and the Pinetop-Woodland Irrigation Company merged; however, the land under the lake (to the "high water mark") is still owned by the Irrigation company as well as all the water. The land surrounding the lake is privately owned and not generally accessible to the public; however, the Arizona Game and Fish Department owns a small parcel of land on the northwest side of the lake at an elevation of , where it maintains a Public Landing for fishing and recreational boating. Rainbow Lake now lies just outside the boundaries of the Town of Pinetop-Lakeside, adjacent to Arizona State Route 260. Description Rainbow Lake is , with a maximum depth of and an average depth of . It is a part of the Walnut Creek drainage, which fills three lakes in the area, including Woodland Park Lake (owned by the Town of Pinetop-Lakeside), Rainbow Lake, and the privately owned Lake of the Woods. Rainbow Lake is mostly surrounded by homes, including the private HOA Shores at Rainbow Lake on the southeast side. It is a prominent recreational feature of the Pinetop-Lakeside area, known for its fishing, boating, and wildlife habitats. Currently, Arizona Game and Fish stocks the lake with catchable-sized rainbow trout in the spring and early summer. Naturally propagating warm water species include largemouth bass, channel catfish, black bullhead, bluegill and green sunfish. The lake also contains illegally introduced northern pike. Because it is shallow and weedy, Rainbow Lake is subject to significant water quality problems. In past years, Rainbow Lake has also had a significant problem with invasive aquatic weeds, particularly the Eurasian watermilfoil, Myriophyllum spicatum. Efforts by the local volunteer group