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Assessment - Southern Oregon Digital Archives

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Williams Creek Watershed Issues<br />

Aquatic Resource Issues<br />

(Based on federal and state law)<br />

In-stream conditions<br />

Endangered Species Act<br />

Coho salmon – Threatened<br />

Steelhead trout - Candidate<br />

Clean Water Act 303 (d) List<br />

Powell Creek (mouth to headwaters)<br />

Parameter for listing – temp >65° F.<br />

Williams Creek (mouth to E/W Fork confluence)<br />

Parameter for listing – temp >65° F.<br />

Fisheries Habitat Conditions<br />

- Lack of large woody debris (LWD)<br />

- Few backwater pools, beaver ponds or alcoves<br />

- Presence of introduced aquatic species<br />

- Some substrate embeddedness<br />

Potential Fish Barriers<br />

- Push-up dams<br />

- Diversion dams and unscreened ditches<br />

- Culverts<br />

Channel Modifications<br />

- Channelization and impoundment of streams<br />

- Removal of streams from natural course to<br />

ditches (i.e.: Davidson Creek)<br />

- Wetlands cut off from creeks<br />

Water Use Impacts<br />

- Seasonal low stream flows<br />

- Few and insufficient in-stream water rights<br />

- Dewatering of seasonal creeks<br />

- Inefficient ditch and irrigation systems<br />

- Illegal water diversions<br />

- Withdrawal of groundwater<br />

Riparian and upslope conditions<br />

Water Quality Impacts<br />

- High water temperatures<br />

- Low dissolved oxygen<br />

- High winter turbidity<br />

- Excessive algal growth<br />

- Use of ditch cleaning, roadside and household<br />

pesticides<br />

- Leaky septic systems<br />

Land Use Impacts<br />

- Increased sediment run-off from residential,<br />

agricultural, road building, gravel extraction<br />

and forestry activities<br />

- Removal of riparian vegetation<br />

- Insufficient diversity of riparian tree species<br />

- Erosion and destabilization of stream banks<br />

- High road density<br />

Williams Creek Watershed <strong>Assessment</strong><br />

xiv

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