2022-04-04_PERMIT FILE - M2022013 (37)

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cover frequently melts between snow events. Classification relationships MLRA 67B is in the Colorado Piedmont and Raton Sections of the Great Plains Province (USDA, 2006). The MLRA is further defined by LRUs A, B, and C. Features such as climate, geology, landforms, and key vegetation further refine these LRU concepts, and are described in other sections of the Ecological Site Description (ESD). NOTE: To date, these LRU's are DRAFT. LRU A is the northeast portion of MLRA 67B, to an extent of approximately 9.0 million acres. Most of the LRU is rangeland, and includes the Pawnee National Grassland, managed by the U.S. Forest Service. Dryland winter wheat/fallow rotations (that may include dryland corn, sunflowers, and/or sorghum) are grown in most counties. Irrigated cropland is utilized in the South Platte Valley. Small acreage and urban ownership are more concentrated on the Front Range. This LRU is found in portions of Adams, Arapahoe, Elbert, Kit Carson, Larimer, Lincoln, Logan, Washington, and Weld counties. Other counties include Boulder, Cheyenne, Denver, Jefferson, and Yuma. The soil moisture regime is Aridic Ustic. The mean annual air temperature (MART) is 50' F. LRU B is in the southeast portion of MLRA 67B (2.6 million acres) and include portions of Baca, Bent, Cheyenne, Kiowa, Las Animas, and Prowers Counties. Most of the LRU remains agricultural. Most of LRU B is rangeland and includes the Comanche National Grassland. Dryland winter wheat/fallow rotations (that may include dryland corn, sunflowers, and/or sorghum) are grown. Irrigated cropland is used in the Arkansas Valley. The soil moisture regime is Aridic Ustic and the MAAT is 52°F. LRU C occurs in portions of Morgan and Weld counties (approximately 1.2 million acres). Most of LRU C is in rangeland. Dryland winter wheat/fallow rotations (that may include dryland corn, sunflowers, and/or sorghum) are grown. The soil moisture regime is Ustic Aridic and the MAAT is 48°F. REVISION NOTES: The Salt Meadow site was developed by an earlier version of the Salt Meadow ESD (2004, revised 2007). This earlier version of the Salt Meadow ESD (2004)was based on input from NRCS (formerly Soil Conservation service) and historical information obtained from the Siltstone Plains range site descriptions (1975). This ESD meets the Provisional requirements of the National Ecological Site Handbook (NESH). This ESD will continue refinement towards an Approved status according to the NESH. Ecological site concept This site occurs on nearly level floodplains. Primary grasses are warm-season mid/tall bunchgrass and cool-season mid rhizomatous grass with secondary warm-season tall rhizomatous grass and grasslike plants. Forbs and shrubs are a minor component. Associated sites R067BY031 CO Sandy Bottomland Sandy Bottomland R067BY033CO Salt Flat Salt Flat R067BY038CO Wet Meadow Wet Meadow Similar sites R067BY033CO Salt Flat The Salt Flat site lacks water table and tall grass species with less overall production.