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| Table 4-24 | |
| Water Quality of Rivers and Streams, in Idaho, the Region, and the U.S., 1986 (in Miles) | |
| Idaho | Alaska | Montana | Oregon | Wyoming | U.S. | |
| Designated Use Support | ||||||
| Total river | 7,310 | 365,000 | 20,532 | 90,000 | 19,655 | 1,290,674 |
| River assessed | 7,310 | 5,025 | 19,505 | 11,855 | 19,655 | 370,544 |
| Fully supporting | 6,046 | 2,662 | 12,184 | 9,665 | 17,386 | 274,537 |
| Partly supporting | 572 | 2,363 | 6,934 | 1,915 | 297 | 70,916 |
| Not supporting | 692 | 0 | 387 | 275 | 1,972 | 22,974 |
| Relative Impact of Pollution Sources (%) | ||||||
| Industrial | 2 | 85 | 2 | 3 | 10 | |
| Municipal | 3 | 1 | 3 | 10 | 4 | |
| Natural | 17 | 0 | 0 | 30 | 43 | |
| Nonpoint sources | 78 | 12 | 95 | 57 | 43 | |
| Sewers, combined | 0 | 0 | 0 | 0 | 0 | |
| Other, unknown | 0 | 2 | 0 | 0 | 0 | |
| Clean Water Act Goals Compliance | ||||||
| Fishable | 6,422 | 18,549 | ||||
| Swimmable | 6,650 | [1]887 | ||||
| Fishable and swimmable | 6,105 | 19,054 | 8,773 | |||
| Source: | U.S. Environmental Protection Agency, National Water Quality Inventory: 1986 Report to Congress. |
| [1] | Only 917 stream miles in the state are designated for swimming. |
Compiled by: Diane Prorak, data input assisted by:
Robert Anton-Erik
Contact: Lily Wai
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