I've been using Google Earth to look at the relevant interesting locations.
Interestingly, the probable landing zone isn't as forested as all the press claimed/was told. There's a lot of open fields. Google Earth provides a lot of insight that they didn't have from the mapping technology available then.
Once you get to Ariel and Amboy, WA, there are a lot of open fields.. I think more fields than forest. Although they said there was cloud cover, there are many large lakes and rivers (Lake Merwin), say, that could have been used as a visual reference.
You can also use these locations in Google Maps
The money was apparently found on the beach of the Columbia River at
45°43'2.88"N 122°45'34.55"W although that may be faulty. Exact location not widely published. I got it from
http://www.waymarking.com/waymarks/WM34G6
which also has a picture of the Tina Bar (the sand beach where it was found)
interesting pics
picture of FBI agents digging the 150 ft area they searched
http://img.groundspeak.com/waymarking/71676dae-3875-4dcd-82c9-8442a3bdffd0.jpg
http://img.groundspeak.com/waymarking/34aa42a3-7aa7-4874-8d5c-81786362f858.jpg
http://img.groundspeak.com/waymarking/f0a705e8-d63a-4600-a4e6-9ae7febe4b12.jpg
(another interesting location, where the hunter found the card with the instructions for lowering the aft stairs of a 727, has not been published?)
Some believe that in order to get from the flight path to the Columbia river beach location, that maybe the money fell in the Mashougal River which flows south by Rt 140, to Mashougal, WA, where it hits the Columbia River that flows NW to the ocean
The Lewis River drains more directly from the predicted jump zone to the Columbia, but it is downstream from the location where the money was found. The Mashougal is upstream from the location, so is a better theory....Although there is some thinking that the water was really high, and stuff could have floated upstream somehow?..so the Lewis River theory is not discounted. (actually the Lewis River theory is most likely if the Amboy , WA chute is real)
The Mashougal River curves around..the farthest N point is approximately.
45°37'42.40"N 122°18'37.61"W. Mashougal, WA is approx 4 miles SW of that point
It is then 22 miles NW from Mashougal, WA to the approx location where the money was found. The Columbia curves a bit there so it would have had to float further.
Amboy, WA where the chute was found, is approx 21 miles NNW from the northern point of the Mashougal River.
The original predicted jump location was believed to have been roughly 10 miles east of Interstate 5, near Ariel, Wash., and the Lake Merwin Dam of the Lewis River. That is 8 miles WNW of the Amboy, WA chute location.
However, a much later conversation between the pilot, Scott, and the then lead FBI agent, suggests that Scott thought they were flying west of I5, not east. If that is true, then the predicted jump location may be off.
here is the reference for the uncertainty about the jump location. (they originally thought he jumped when the pilot felt a "curtsy" of the plane, due to the down/up motion of the stairs when you walk them in flight (the FBI re-enacted that...although not a human jump)
http://www.crimelibrary.com/criminal_mind/scams/DB_Cooper/7.html
....The jump area was believed to have been roughly 10 miles east of Interstate 5, near Ariel, Wash., and the Lake Merwin Dam of the Lewis River, which separates Clark and Cowlitz counties. The FBI helped pinpoint that location by staging a reenactment of the jump. A 200-pound sled attached to a parachute was heaved from the aft stairs of a 727 traveling at the same speed and altitude as the Cooper jet at the precise place where Capt. Scott felt the jet genuflect.
But later calculations placed the jump just west, not east, of I-5, near the village of Woodland, Wash., and the Columbia River. The costly searching near Ariel was wasted, Himmelsbach said. Remarkably, he said this revelation occurred to him in 1980 when, on the day of his retirement, Capt. Scott paid him a courtesy visit. They got to talking, and Scott let drop that the jet was traveling west of where the FBI believed it had been. No one with the agency has ever offered an explanation as to how such a goof could have gone undetected for nine years.....
So Woodland WA is another interesting location, and it's right on the Lewis River, although the Lewis hits the Columbia downstream from where the money was found, as noted before.
here is a jpg of the flight path map that the FBI apparently thought was correct back then. It is from the FBI evidence
http://seattlepi.nwsource.com/dayart/20071123/450cooper_00462_mapvert.jpg
when I zoom in on it, the 2010 mark appears to be near the Lake Merwin dam location. (2010 is probably a reference to 8:10 when the crew felt the "pressure bumps" which is when they "think" he jumped. The cockpit light indicated the stairs lowered at 8:05 which is the 2005 mark. That's when Cooper yelled "No!" when they asked if he needed help.
Although, it's been reported the predicted jump time was 8:11. There is a faint 2011 mark on that map also. So there could be 1 minute of variation in predicted jump area, in addition to other issues with location.
However, Wikipedia claims the mixup of predicted jump area was "east" of the first location, not "west" as I note above..from this article
http://home.earthlink.net/~quade/dbcooper.html
So it's unclear what Scott told Himmelsbach. If it was more east like that article says, it's closer to Amboy where the chute was found.
Like I've said before: while the experts made fun of Cooper's actions that night, in hindsight I think he was acting the most expertly of everyone involved.
However, given that no one knew when he jumped exactly, the FBI did a pretty good job afterwards of isolating a probable jump site, based on the info from the pilot. I'm not sure if they used flight recorder information but maybe.
The key predicted area seems to be bounded by these points.
Note it doesn't seem that heavily forested to me. a lot of farmland
Woodland, WA
Ariel, WA
Amboy, WA
Mashougal, WA
Vancouver, WA (beach location)