It won't result in the raising of flood water elevations. The project was designed by the PFBC Stream Habitat team after careful review and the idea is to both add habitat and narrow and deepen the stream. By narrowing the stream using log framed deflectors/log-faced stone deflectors, the forced water will push away from the banks and into the center. This will actually deepen the stream because that forced water will slowly erode the stream bed, similar to how a dam/waterfall creates a plunge pool. So the loss of horizontal area is accounted for through the gain of vertical area, if that makes sense.
And yes, the toe will be stabilized throughout the section along 64 and behind the fire hall. This should result in further armoring of the section and an ultimate reduction in sediment to the stream, which is also really nice for fish and their gills.
over 100 large boulders are going to be placed in the thalweg randomly as well. This should create some scour behind each of them and a place for fish to hold out of the current. the hope is to draw fish to this section and allow them to have what they need to stay there throughout the year. Habitat is probably one of the most limiting factors for fish population in that section of stream.
Also, the hope is to help educate those who are doing all the cutting of trees along the stretch. That is clearly a huge issue as well. There will be a nice planting of over 400 native trees/shrubs up on the floating feather property this April/May.