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!
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- Small rock
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- Adding small rock to log jam
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- Placing rock
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- Agency visitors being briefed on design
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- More slash!
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- Getting ready to “snap asparagus” to make roughened logs
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- Roughening end of log
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- That’s a rough log end
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- Notice the very rough log ends
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- Sediment control
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- Engineer Aaron confers with operator
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- Jenne talks to engineer Aaron
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- Rock on log jam
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- Top end is nearly done
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- Top end is built tough
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- Log jam will present rough surface to flowing water
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- Fish shadow looks like a shark
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- Can you see the fish? (Hint: lower left corner)
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- Diversion channel runs clear and clean
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- Placing crossing angled logs
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- Placing crossing angled logs
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- More slash!
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- Stages: soil, slash, boulders
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- Boulders
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- Rocking the log jam
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- Bringing in more rock
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- Seed mix has arrived
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- Slash and logs ready to be used
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- Returning soil to the log jam
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- Returning bank spoils to rebuild bank
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- Packing soil
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- Placing boulder
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- Great progress made today
