วีดีโอ

Megatonnes of sediment builds up behind dams in few decades. Remove the dam and most of that will wash downstream, despite efforts to stabilize it with plants. It will smother spawning beds and do other damage, and while the river will-probably, eventually, mostly-clean itself, it only takes one year’s total failure to destroy a spawning run. Suggestion? Build one suction dredge that can be taken apart, transported by truck, and reassembled behind a dam scheduled for removal; we should be able to schedule dam removals so that one or two machines will do for all. Dredge most of the sediment out from behind the dam, and it will not be there to wash downstream. I don’t know where/how we dispose of all that, if it’s contaminated with agricultural and other chemicals-but then we don’t want to let that contaminate the downstream river bottom anyway. Where it is clean enough, it’s silt, very rich soil, and it could be sold to farmers or as a component of potting soil. There are no wastes, only un-utilized resources.

Megatonnes of sediment builds up behind dams in few decades. Remove the dam and most of that will wash downstream, despite efforts to stabilize it with plants. It will smother spawning beds and do other damage, and while the river will-probably, eventually, mostly-clean itself, it only takes one year’s total failure to destroy a spawning run. Suggestion? Build one suction dredge that can be taken apart, transported by truck, and reassembled behind a dam scheduled for removal; we should be able to schedule dam removals so that one or two machines will do for all. Dredge most of the sediment out from behind the dam, and it will not be there to wash downstream. I don’t know where/how we dispose of all that, if it’s contaminated with agricultural and other chemicals-but then we don’t want to let that contaminate the downstream river bottom anyway. Where it is clean enough, it’s silt, very rich soil, and it could be sold to farmers or as a component of potting soil. There are no wastes, only un-utilized resources.

Great job, and more flora means more bees and honey.

❤

WOW

I wonder has there been any consideration reintroducing beavers to the river? They could be especially useful in the areas where the dams used to exist restoring riparian habitat, slowing water and creating environments for fish to breed.

Fisheries engineering 😂😂😂 nature engineers fisheries not socially awkward humans.

Saying humans are intelligent is probably the world biggest con. Nature is intelligent we are just hairless monkeys, if those dams were economically viable they would have never have been destroyed.

Does the birth stream marker in pink salmon stay in the fish for shorter than salmon or steelhead? Smaller returns could be from lost markers?

Pinks would ne almost always spawning in the lower reaches, as they rarely spawn in th mid to upper reaches, according to WA, Ca, and OR populations, north in Canada and Alaska inland lakes or other options pinks may move up furyher for other reasons.

Skallam Tribe does hire many Biologists, and those Hatcheries must have had active Scientists, so I am just staying my personal knowledge. Was in area when dams wete being removed, hearing complaints of loss of hydropower, though not unsympathetic, but must guess if any co-generation of electricity being used now.

Many plant species would not be very tolerant to saltwater intrusion, and I do know sharks( dogfish) appeared in lower Elwha.

Above 23 ' C, most salmonids, trrout, whitefish, etc. cause Hazards for these Species as they are not tolerant of warmer water.

Were salinities being taken before the dams were removed, that would be an excellent series for prior data to exam.

Good, would expect Hatchery fish to do so as I personally daw the lower Elwha and how complex those "Hatcheries" are, so hopeful.

Steelhead are the best jumpers, can return to saltwater after freshwater spawning, so that is excellent news ir Research.

Appreciate any insights, the Webinar, and your analysis, it will help to redefine Analysis, variable factors, recruitment Status of studied Species, that is great!

Turbidities do exist, and help to hide fish, salmonids for example. Clear water can be hard to fish as the fish may see you.

Sediment is not always a bad thing, but I do share some of those worries. Klamath Dam Removals will do similar factors, yet for the removals.

What of the definition of an estuary? Seems like saltwater intrusion from the river mouth proves Salinities in the lowest part of the river went up. This would benefit juvenile anadromous fishes, organisms, and saline tolerant plant Species, I would guess.

Interesting. If I was a landowner wanting to enhance trout spawning results I would want to include jumps to exclude suckers and other fish that prey on trout eggs and young. That would of course depend on any of the rough fish are endangered however.

Did they make a LIDAR scan of the area before and after the dams were removed? If you have scans, it may help you compare sediment movement over time.

Great job

I think they should remove ALL DAMS!. Or at least, let the fish back upstream! What were they thinking? Dams were made to starve out the undesirable people, downstream. Man made lakes cover Native American Villages. I see this in Lake Mead, Shasta, Folsom, Oroville, and many other man made lakes. The drought really exposed the truth. I love the dam removal. Nature really needs the water to flow. Fish can not spawn, unless they can get upstream. Dams ruin the ecology, for generations.

Great to see the Elwha recovery and removal of antiquated dams. It will be interesting to see the restoration of the Klamath.

Outstanding presentation, question and answer session...there is so much we don't know yet but the trend is clear how quickly a river-riparian system will reboot after dam removal...I am most impressed with the Chinook salmon strays returning after the sediment flows have subided

p͎r͎o͎m͎o͎s͎m͎

I like your vids!! 😀 Keep making great content! Have you checked promosm!? You should use it to promote your videos!