flat-crested weir

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• Weir — A weir (IPAEng|wɪɚ) (also known as a lowhead dam) is a small overflow type dam commonly used to raise the level of a river or stream. Weirs have traditionally been used to create mill ponds in such places. Water flows over the top of a weir,… …   Wikipedia

• River Thames — Thames redirects here. For other uses, see Thames (disambiguation). Coordinates: 51°29′56″N 0°36′31″E / 51.4989°N 0.6087°E / 5 …   Wikipedia

• Marble Mountain Wilderness — IUCN Category Ib (Wilderness Area) …   Wikipedia

• Colorado — This article is about the U.S. state of Colorado. For the former U.S. territory, see Colorado Territory. For the river, see Colorado River. For the physiographic region, see Colorado Plateau. For other uses, see Colorado (disambiguation). State… …   Wikipedia

• Farallon Islands — Farallon National Wildlife Refuge IUCN Category IV (Habitat/Species Management Area) Southeast Farallon Islands from the west, with Maintop Island in the foreground (right) …   Wikipedia

• Clear Lake National Wildlife Refuge — in northeastern California consists of approximately 20,000 acres (81 km2) of open water surrounded by over 26,000 acres (110 km2) of upland bunchgrass, low sagebrush, and juniper habitat. Small, rocky islands in the lake provide… …   Wikipedia