Salmon Habitat Requirements
Type and age of salmon that use wetlands in general
High populations of some preditors can be determental to salmon at some stages in their lifecycle
Characteristics of Aumsvill Wetlands Site
Type and age of salmon in Mill Creek
Overall, the water quality factors that we tested for were within the salmon’s optimal range.
Conclusion: Could and would Aumsville Wetlands be used by salmon as habitat?
To answer this question we had to examine the pathways to the site, the physical characteristics of the site, and its water quality.
In the not to distant past, Mill Creek was supported by a run of fall Chinook salmon, but few if any return now (Gary Galovich ODFW). The main reasons for this decline is a reduction in the amount of habitat of salmon due to modifications, like the construction of dams and other barriers, and a decrease in water quality. Increased used of pesticides and fertilizer in agriculture, increased levels of toxins, and increased sediment runoff from logging, agriculture, and construction, have all negatively effected salmon populations. At the Aumsville site in particular, we know that the many smaller ponds were used as a hatchery in the past. Because of the decrease in the amount of salmon in Mill creek, the county would have to carefully consider whether to try to restore this to salmon habitat or concentrate in another direction.