How small is the small river? And how deep?
Are the currents fast and treacherous? Or gentle and calm?
Are there dangerous animals in the river, such as pirahnas or
crocidiles?
Are the river banks relatively dry and firm, or muddy and
slippery?
*****
unless you're trained, pole vaulting sounds a little risky. You
could injure yourself during landing, or worse, lose your grip or
have the bamboo pole collapse under you, and fall into the river.
Then again, if you're desperate it just might work.
Tying yourself with the rope and trying to swim across is propbaly
the best idea as long as the current isn't too strong, and you're a
good swimmer. Just make sure the rope is long enough to let you get
to the other side before jumping in!!!