watershed: coniferous forest, juniper woodlands, and shrub-steppe. There are also some meadow lands within the pine forest zone and in riparian areas along drainages that empty into the reservoir from the north and south. The watershed to the north, south, and west of the reservoir are pine forest. The area east of the reservoir is mostly juniper woodlands. The areas immediately surrounding the reservoir are shrub-steppe. The vegetation in the coniferous forest is dominated by ponderosa pine. Other tree species found in the watershed are lodgepole pine, sugar pine, white fir, and incense cedar. The forest understory include mountain mahogany, big sagebrush, low sagebrush, rabbitbrush, bitterbrush, and manzanita. Other common forest plants include ceanothus, huckleberry, snowberry, blue elderberry, chokecherry, twinberry, and serviceberry. Flowering plants include lupine, vetch, asters, biscuitroot, balsamroot, wild strawberry, yarrow, and dandelion. Grasses found in the forested areas include Idaho fescue, intermediate wheatgrass, bluebunch wheatgrass, bottlebrush squirreltail, and Thurber needlegrass. Invasive species include Kentucky bluegrass and cheatgrass brome. There are also quaking aspen in the upland meadows areas dispersed within the pine forest portion of the watershed. Juniper woodlands are drier forest areas with shallow, sandy soil. Western juniper is the dominant species. The understory is similar to the pine forest with big sagebrush and bitterbrush widely distributed. Mountain mahogany, low sagebrush, rabbitbrush, and gray horsebrush are common in some areas. Grasses include Idaho fescue, bluebunch wheatgrass, bottlebrush squirreltail, granite prickly-phlox, western needlegrass, and Sandberg bluegrass. The shrub-steppe areas around Gerber Reservoir are generally dominated by big sagebrush with low sagebrush common in rocky areas. Other vegetation includes rabbitbrush, spiny hopsage, wax currant, balsamroot, desert parsley, willow dock, blazing star, sunflower, plains mustard, tarweed, manna grass, buckwheat, and ryegrass. Environment Gerber Reservoir is an irrigation impoundment created by Gerber Dam. The reservoir covers . It is approximately long and wide. The reservoir has a branching shape with shallow arms that follow various watershed drainages. There is one permanent island in the middle of the reservoir. The reservoir has an average depth of with a maximum depth of . Its elevation is above sea level. While very few aquatic plants live in the shallow branches, the reservoir is still very productive. Its trophic state is classified as eutrophic. A combination of suspended inorganic matter and phytoplankton growth limit the water's transparency. In the main part of the reservoir, the water is deep enough for thermal stratification. In the