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IF Cooper actually landed in the Columbia River, and I don't think he did, then he would almost certainly have landed in the river after it makes its turn to the North towards Tina Bar and not in the portion of the river that flows East to West through Portland and Vancouver.

Do you base this solely on the timing of the jump, or is there a hydrological reason?

At the present time, there is nothing that conclusively supports any flight path for the airliner in the Vancouver/Portland area.  However, there is evidence (which has been discussed at length both here and on DZ) that the airliner flew directly from about the Malay Intersection to the Canby Intersection and bypassed Portland on the west side.

The direct route from the Malay Intersection to the Canby Intersection passes almost directly (within a few hundred feet) overhead of Tina Bar.  The distance from the Malay Intersection to the Canby Intersection is 67.0 nautical miles.

According to a note in the "FBI files" that are online and a copy of the ARINC teletypewriter print outs, the airliner reported at 8:22 PM PST that it was 23 DME miles south of the Portland (now Battleground) VORTAC.  However, an individual from NWA gives the time of arrival of that voice message as 8:18 PM PST in Seattle which was phone-patched into the ARINC radio communications.

On the direct route from the Malay to Canby Intersections, this corresponds to a point that is 19 nautical miles south of Tina Bar.  If the airliner had a ground speed of exactly 3.0 nautical miles per minute, this would put the airliner 6:20 (minutes:seconds) south of Tina Bar.  This means that the airliner passed overhead of Tina bar at about 8:11:40 PM PST.

If the money landed directly on Tina Bar, which it did not, then Cooper would have had to separate from the airliner about 8:11:35 PM, assuming a 1500 foot "throw distance".  Cooper would have to separate from the airliner within the next 3.5 nautical miles or he would have landed on solid ground in Portland itself.  This means that the latest time that Cooper could have jumped and landed in the Columbia River would be about 8:12:45 PM.

The above assumes that Cooper was a no-pull, no cross wind, etc..  In reality, Cooper was probably a no-pull and there was a cross wind.  This means that Cooper impacted land or water within about 40 to 60 seconds after separating from the aircraft.  So the airliner was probably about over the western edge of the Columbia River when Cooper jumped.  And he probably impacted on land on the east side of the Columbia River or on Caterpillar Island itself.

All of the above numbers can be refined if accurate data about the airliner's actual flight path can be located.  Nevertheless, the jump time estimates are consistent with the presently available data.

From a hydrological point of view, if Cooper had landed in the area of the Columbia River that runs east and west, I think he and/or the money would have ended up on the western bank of the Columbia rather than the eastern bank.  Going around that 90 degree turn would cause that.

What is the time frame you are putting the plane at the Maylay intersection, I'm getting approx. 45 nautical miles to Tina Bar, or approx. 15 minutes.

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Unless some other source can be shown which explains 'element-x' at Tina Bar, the one logical source is the 1974 dredging spoils pulled from a region known to contain element-x, those dredging spoils then deposited on Tina Bar in 1974

Why is Tom against the dredge theory if this is the logical source? I would believe this theory, but only if it can get past the pump. it is extremely logical, but can it become a fact?

I cant speak for Tom, but my feeling is (a) Tom didn't think the presence of element-x in his bill scans was unusual, (b) he didn't think the level of 'x' was significant enough to warrant further exploration, (c) he thought the USGS chemist's claims were either bogus or nonsense or wrong, (d) ... the horoscope for element-x was wrong!   

Fact is, until I talked to the USGS chemist I saw nothing unusual about element-x in Tom's scans. It was the USGS chemist that raised a flag the moment I mentioned element-x.

Tom's claim was that there were no 1974 dredging sediments left six years later in 1980, on Tina Bar, to contaminate anything with. The USGS chemist wasn't sure about that claim.

The chemist suggested that wood, trees, and other artifacts at Tina Bar be tested for element-x and compared with similar artifacts from other beaches on the Columbia - as a control. He suggested that some lab work should also be done to establish a dose-response timeline for exposure to element-x; he said the USGS had already done some studies and he would get that info to me ....

A primary question we were tasked to answer was "when" the money had arrived on Tina Bar. Contamination levels might help answer that, but the work was not completed ... Tom didn't think the presence of element-x was significant and he had other priorities. Frankly, I was being intimidated from every possible angle and I (and others) finally just said "Fuck it!" and I dropped the whole thing to wait for Tom's work to be completed. Later I set up a second round of testing using Brian Ingram bills but word of that leaked out and that was shot down also! Ingram abruptly cancelled delivering money specimens to us! (People were really pissed and at that point we literally gave up on this whole fiasco ...everything had become political.) Those are the facts.      
       

Still, it sounds like an experiment we can do, assuming we can get the material from the Columbia to test.

Without bill samples there is no point

Q. What is the time limit on cadaver dogs finding human remains?

A. There’s not a known time limit, but there’s some interesting work going on in the Mississippi Delta where dogs are helping find bones and remains from Mound civilization burials (a Native American culture) that go back 800 or 1,200 years. There is very little scent associated with these old bones. There’s much to be learned here in terms of exactly what the dogs are detecting in these bones. But there are enough positive alerts and recoveries that we know dogs are capable of doing this. Dogs have also been used to help find the remains of missing military personnel in Vietnam.

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If, as R99 believes, Cooper landed outside of the Columbia and near Tina Bar, then it might still be possible to find his remains on Caterpillar Island:

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Q. What is the time limit on cadaver dogs finding human remains?

A. There’s not a known time limit, but there’s some interesting work going on in the Mississippi Delta where dogs are helping find bones and remains from Mound civilization burials (a Native American culture) that go back 800 or 1,200 years. There is very little scent associated with these old bones. There’s much to be learned here in terms of exactly what the dogs are detecting in these bones. But there are enough positive alerts and recoveries that we know dogs are capable of doing this. Dogs have also been used to help find the remains of missing military personnel in Vietnam.

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Has anyone tried using a cadaver dog in these areas?

Flyjack was on here with that theory. he showed links to them finding people 300 feet below the surface. I'd bet if the bones were close to the surface they would find them?

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Dogs have also been used to help find the remains of missing military personnel in Vietnam.

Kinda answers it right there...

Did we ever go over this article? "Formless fist size clump"....finding more than just pieces on the beach?

I don't know if they made a map..