Just to clarify ... it's no way to tell out from the log if it's on "dry" ground or in a creek. The log shows that it was on "ground level" relative the HP when the log ended though ... ?Emiel, you may have understood @slup info above.
Fell like a rock, he means it fell fast and straight down, the info following does not mean that it went into water . . .
As he and sar104 mentioned, it's near the ground / on the ground, and look good 15m SE of where the GPS said, radiate out in a circle from that point, and good luck.