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| Table 4-23 | |
| Water Quality of Lakes and Reservoirs, in Idaho, the Region, and the U.S., 1986 (in Acres) | |
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Idaho | Alaska | Montana | Oregon | Wyoming | U.S. | |
| Designated Use Support | |||||||
| Total area | 362,718 | 12,787,200 | 756,450 | 500,000 | 21,495,137 | ||
| Area assessed | 362,718 | 27,513 | 663,363 | 192,000 | 7,630,161 | ||
| Supporting uses | 362,624 | 14,598 | 629,518 | 112,700 | 5,456,128 | ||
| Partly supporting | 94 | 12,915 | 20,595 | 75,200 | 1,285,709 | ||
| Not supporting | 0 | 0 | 13,250 | 4,100 | 625,140 | ||
| Relative Impact of Pollution Sources (%) | (avg.) | ||||||
| Industrial | 1 | 19 | 0 | 1 | |||
| Municipal | 1 | 0 | 1 | 8 | |||
| Natural | 8 | 0 | 49 | 12 | |||
| Nonpoint sources | 90 | 51 | 50 | 76 | |||
| Sewers, combined | 0 | 0 | 0 | 0.03 | |||
| Other, unknown | 0 | 30 | 0 | 3 | |||
| Clean Water Act Goals Compliance | |||||||
| Assessed | 362,718 | 663,363 | 192,000 | 411,284 | |||
| Fishable | 362,718 | 650,113 | 409,223 | ||||
| Swimmable | 362,718 | 663,363 | 230,335 | ||||
| Fishable and swimmable | 362,718 | 112,700 | |||||
| Source: | U.S. Environmental Protection Agency, National Water Quality Inventory: 1986 Report to Congress. |
Compiled by: Diane Prorak, data input assisted by:
Robert Anton-Erik
Contact: Lily Wai
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