Hydrographic Regions and Basins

Lyon
		Region	Basin	Sq Miles	Acres	Hydrographic Basin/Sub-Basin Name	Counties	Nearest Cities	Designated
			Total	110,545	70,748,800	Square miles/acres
	[5] WEST CENTRAL REGION (Hydrographic Region 5)
	78	5	75	178	113920	Brady Hot Springs Area	Churchill; Lyon	Bradys Hot Springs; Fernley	Yes
	79	5	76	120	76800	Fernley Area	Lyon; Washoe; Storey; Churchill	Fernley; Hazen	Yes
			Total	1,656	1,059,840	Square miles/acres
	[6] TRUCKEE RIVER REGION (Hydrographic Region 6)
	86	6	83	285	182400	Tracy Segment	Storey; Washoe; Lyon	Sparks; Fernley	Yes
			Total	2,300	1,472,000	Square miles/acres
	[8] CARSON RIVER REGION (Hydrographic Region 8)
	106	8	101	2022	1294080	Carson Desert	Churchill; Pershing; Lyon	Fallon; Stillwater	Yes
	108	8	102	480	307200	Churchill Valley	Lyon; Churchill; Douglas; Storey	Fallon	Yes
	109	8	103	369	236160	Dayton Valley	Lyon; Storey; Carson City; Douglas	Dayton; Virginia City	Yes
			Total	3,519	2,252,160	Square miles/acres
	[9] WALKER RIVER REGION (Hydrographic Region 9)
	113	9	107	479	306560	Smith Valley	Lyon; Douglas	Wellington	Yes
	114	9	108	516	330240	Mason Valley	Lyon; Mineral; Douglas	Yerington; Mason	Yes
	115	9	109	586	375040	East Walker Area	Lyon; Mineral	Bridgeport; Yerington	No
	116	9	110A	502	321280	Walker Lake Valley/Schurz Sub-Area	Mineral; Lyon; Churchill	Schurz	No
			Total	3,046	1,949,440	Square miles/acres
	[10] CENTRAL REGION (Hydrographic Region 10)
	133	10	123	227	145280	Rawhide Flats	Churchill; Mineral; Lyon	Schurz; Fallon	No
			Total	46,783	29,941,120	Square miles/acres