More logs, more slash, more boulders, more rock, more soil! Excellent progress was made today on the log jam. The upstream end is just about completed with soil compacted up to grade. Photos from today show various stages of construction and highlight the materials being used. Considering how much rock was used, perhaps the theme today was: rock on!
Besides rock, another theme today relates to the roughness of wood. Roughness adds friction, and that means water will be slowed when it encounters the rough log jam. When water slows, it drops some of the sediment load it is carrying. The other aspect of this particular rough log jam design is our expectation that during very high water events, water that gets behind the log jam will also encounter the rough top surface of the log jam, and thus slow down. We expect the design will help rebuild the bank that was there decades ago!
Small rock
Adding small rock to log jam
Placing rock
Agency visitors being briefed on design
More slash!
Getting ready to “snap asparagus” to make roughened logs
Roughening end of log
That’s a rough log end
Notice the very rough log ends
Sediment control
Engineer Aaron confers with operator
Jenne talks to engineer Aaron
Rock on log jam
Top end is nearly done
Top end is built tough
Log jam will present rough surface to flowing water
Fish shadow looks like a shark
Can you see the fish? (Hint: lower left corner)
Diversion channel runs clear and clean
Placing crossing angled logs
Placing crossing angled logs
More slash!
Stages: soil, slash, boulders
Boulders
Rocking the log jam
Bringing in more rock
Seed mix has arrived
Slash and logs ready to be used
Returning soil to the log jam
Returning bank spoils to rebuild bank
Packing soil
Placing boulder
Great progress made today