Just wanted to toss a theory regarding the money find into the ring and see what everyone thinks of it.
1. Cooper lands in or near the suspected drop zone.
2. His plan for finding his way out of the woods is to follow the waterways. The area has rivers, streams, lakes and tributaries which can all serve as points of reference for navigating his way out (after all, if you're ever lost in the woods, the best thing to do is find water and follow it). His plan is to walk until he finds water and then follow that water.
3. He walks until he finds a stream. He follows it, knowing it will likely lead into something bigger. This stream leads into the Lewis. He then follows the Lewis, knowing it will lead into the Columbia. He reaches the area where the Lewis flows into the Columbia. He now knows precisely where he is and where he needs to go. He turns and heads south to follow the Columbia upriver, knowing that there is a town X number of miles over here or a well-traveled road X number of miles over there.
4. His plan is to walk with the money in tow until he reaches the edge of a town or road. He will then hide the money just outside the town or road in a place that he will be able to easily remember and get back to soon. He knows that he will have to make contact with someone to use a phone or bum a ride somewhere. And if he walks into a diner asking to use the phone or asks if he can hitch a ride somewhere and he's all dirty and disheveled from being in the woods and he's carrying a giant bank bag ..... well, that may look a tad suspicious considering the hijacking is playing out all over the news. By ditching the money, he may still be dirty and disheveled but at least he's not toting around a huge sack of twenties.
5. He reaches the edge of the town or the road he was looking for (which he was able to find using the waterways as his guide). By this time, he is south of Tina Bar (upriver). He figures he will stash the money, seek some help getting home and then lay low and let things cool off a bit. He will then return to the area where the money is under the guise of a "camper" or "hiker" or "fisher" and will "camp," "hike" or "fish" in the area until the coast is clear and he can retrieve the money. He uses the Columbia as a point of reference and finds a particular landmark in the terrain in which to bury the money. After all, what better point of reference to use than the Columbia?
6. It's a good plan but Cooper makes one major mistake: The water level is low at this time of year and he buries the money too close to the bank of the Columbia. He does not return for the money until the spring (either by design or not). When the snow melts in the spring, the water level in the Columbia rises considerably and rises high enough to sweep the money away and send it downriver.
7. The money floats downriver (north) where it makes landfall at Tina Bar. Maybe only some of it washed up on Tina Bar while the rest continued elsewhere. Maybe the money that was found at Tina Bar is the only money he ended up with (while the rest was lost during the jump). Regardless, Cooper never finds his loot.
Now, if Cooper were to land in the suspected drop zone and find the Lewis River, then follow the Lewis to the Columbia, then follow the Columbia to a point where he is now south of Tina Bar, how many miles would that be? Is something like this even feasible?