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Lower B, B-1, or Lower Somerset 4 to 12 ft thick, mined at King (old where combined with Upper B Interval, 5 - 30 ft Bowie), and in places at Somerset A, Old King, or Snowshoe 1 to 3 beds 0 to 6 ft thick, never mined significantly Interval, 0-20 ft Rollins Sandstone Surface Water The XPA is located on the north side of the valley of the North Fork of the Gunnison River, known locally and less formally as the North Fork River. The North Fork is part of the Colorado River system. It is a perennial stream, formed by the joining of Anthracite Creek and Muddy Creek approximately nine miles east of the plan area, immediately downstream from the Paonia Dam and Reservoir (located on Muddy Creek). The North Fork joins the Gunnison River proper west of Hotchkiss, approximately 20 miles southwest of the XPA. North Fork flow is partially regulated by Paonia Dam, and is significantly diminished during irrigation season by numerous agricultural diversions. Principle tributaries of the North Fork upstream from Terror Creek are Thompson and • Hubbard creeks and Raven Gulch. Downstream tributaries are Minnesota, Roatcap, Reynolds, Jay, Cottonwood, and Leroux creeks. In addition to Terror Creek, Hubbard, Minnesota, Cottonwood, and Leroux creeks drain significant areas. East of Paonia all of the watersheds are quite steep with high relief for such small watershed areas. Except for Hubbard Creek and Terror Creek, defined channels have not been extensively developed due to the resistance of the Mesaverde Group sandstones. Ten to 20-ft drops over sandstone ledges are common. The elevation of the East Fork of Terror Creek at the north boundary of the area is 8,400 feet and at the south edge 7,250 ft, producing a gradient of about 9% for the 2.24 miles of the stream within the XPA. The XPA is drained by the West and East Forks of Terror Creek. According to existing surface water inventories performed for the Ironpoint Tract Federal coal lease and Bowie No. 2 mines, there are one pond and three springs in the eastern portion of the XPA. The Bowie 7.5 minute Quadrangle Map indicates there is one additional pond and one ditch located within the XPA. The pond is located west of the northwest comer of section 31. The Julian Ditch enters the XPA in section 29. This ditch flows into the East Fork of Terror Creek in the northeast corner of section 32. Terror Creek Reservoir (a.k.a. Bruce Park Reservoir) is northeast of this XPA. This reservoir is filled during spring runoff from waters diverted from a watershed near the Overland Reservoir and a diversion ditch known as the Hubbard Creek Extension of the • Holy Terror Ditch.