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Manastash Ridge is a long anticline mountain ridge located in central Washington state in the United States. Manastash Ridge runs mostly west-to-east in Kittitas and Yakima counties, for approximately 50 miles. The ridge is part of the Yakima Fold Belt of east-tending long ridges formed by the folding of Miocene Columbia River basalt flows. [1]
The Manastash Ridge Observatory (MRO) is an astronomical observatory built in 1972 by the University of Washington. [1] It is located in a remote area approximately 14 kilometers (8.7 mi) west of Ellensburg, Washington, at an altitude of 3930' (1198 m), a longitude of 120.7278 degrees West, and a latitude of +46.9528 degrees, [2] and can be reached by dirt roads from Ellensburg or Selah. [3]
The Manastash Ridge Radar is a passive radar which uses commercial FM broadcasts to study ionospheric turbulence as well as meteor trails, and aircraft.The radar is passive and bistatic; there are receivers located at the University of Washington as well as at Manastash Ridge, which are synchronized to permit coherent operation.
The legend of the bottomless hole started on February 21, 1997, when a man identifying himself as Mel Waters appeared as a guest on Coast to Coast AM with Art Bell.Waters claimed that he owned rural property nine miles (14 km) west of Ellensburg in Kittitas County, Washington, that contained a mysterious hole.
The Umtanum Ridge Water Gap was designated a National Natural Landmark in 1980. [4] The landmark is characterized by a series of steep-sided ridges in the Columbia River basalt which are cut through axially by the Yakima River. A water gap was cut by the Yakima River through anticlines named "Manastash Ridge" and "Umtanum Ridge".
Shaded-relief map showing ridges of the Yakima Fold Belt of south-central Washington, mostly between Interstate 90 (red line) and the Columbia River (bottom). Red square in center is the city of Yakima, red rectangle at lower right is the Tri-Cities, red circles are various cities, triangles are the Mount Rainier, Mount St. Helens, and Mount Adams volcanoes of the Southern Washington Cascades.
The terrain is undulating and dominated by three east-west parallel ridges, the Saddle Mountains, Manastash Ridge, and Umtanum Ridge anticlines, which are part of the Yakima Fold Belt near the western edge of the Columbia River Plateau. Vegetation consists of sagebrush, bitterbrush, and bunch grass.
From the gap, the highway crosses into Yakima County and turns southwestward as it begins its descent from the ridge. [15] [16] The Fred G. Redmon Bridge carries I-82 over Selah Creek in the Manastash Ridge. Just north of Selah, I-82 crosses the Fred G. Redmon Bridge, a 325-foot-high (99 m), twinned arch bridge that spans Selah Creek.