Hydrographic Regions and Basins
Clark
 RegionBasinSq MilesAcresHydrographic Basin/Sub-Basin NameCountiesNearest CitiesDesignated
   Total110,54570,748,800Square miles/acres   

[10] CENTRAL REGION (Hydrographic Region 10)
 175 10 160 463 296320 Frenchman Flat Nye; Lincoln; Clark Mercury No
 176 10 161 655 419200 Indian Springs Valley Clark; Lincoln; Nye Indian Springs Yes
 177 10 162 789 504960 Pahrump Valley Clark; Nye Pahrump; Las Vegas Yes
 178 10 163 236 151040 Mesquite Valley (Sandy Valley) Clark Goodsprings; Las Vegas Yes
 179 10 164A 253 161920 Ivanpah Valley/Northern Part Clark Roach; Searchlight Yes
 180 10 164B 73 46720 Ivanpah Valley/Southern Part Clark Jean; Roach; Goodsprings Yes
 181 10 165 96 61440 Jean Lake Valley Clark Jean; Goodsprings Yes
 182 10 166 34 21760 Hidden Valley Clark Henderson; Jean Yes
 183 10 167 530 339200 Eldorado Valley Clark Boulder City; Searchlight Yes
 184 10 168 298 190720 Three Lakes Valley-Northern Part Lincoln; Clark Indian Springs No
 186 10 169B 391 250240 Tikapoo Valley/Southern Part Lincoln; Clark Alamo; Indian Springs No
   Total46,78329,941,120Square miles/acres   

[13] COLORADO RIVER REGION (Hydrographic Region 13)
 228 13 205 979 626560 Lower Meadow Valley Wash Lincoln; Clark Caliente; Moapa Yes
 233 13 210 657 420480 Coyote Springs Valley Lincoln; Clark Moapa; Alamo Yes
 234 13 211 311 199040 Three Lakes Valley-Southern Part Clark Indian Springs Yes
 235 13 212 1564 1000960 Las Vegas Valley Clark Las Vegas; Henderson Yes
 236 13 213 563 360320 ado River Valley Clark Laughlin; Boulder City Yes
 237 13 214 338 216320 Piute Valley Clark Searchlight Yes
 238 13 215 630 403200 Black Mountains Area Clark Boulder City; Overton Yes
 239 13 216 156 99840 Garnet Valley Clark North Las Vegas; Moapa Yes
 240 13 217 80 51200 Hidden Valley Clark North Las Vegas; Moapa Yes
 241 13 218 318 203520 California Wash Clark Moapa Yes
 242 13 219 91 58240 Muddy River Springs Area Clark; Lincoln Moapa; Overton Yes
 243 13 220 252 161280 Lower Moapa Valley Clark; Lincoln Logandale; Overton Yes
 245 13 222 907 580480 Virgin River Valley Lincoln; Clark Mesquite; Bunkerville Yes
 246 13 223 533 341120 Gold Butte Area Clark Overton; Logandale No
 247 13 224 108 69120 Greasewood Area Clark Bunkerville; Overton No
   Total12,3767,920,640Square miles/acres