Downstream berthing is difficult. As the boat slows, it loses steerageway, but it is still being swept towards the pontoon, out of control. If a downstream berth is approached, use the shallowest approach angle possible and get the stern line or an amidships line made fast quickly, or consider reversing into berth from opposite direction.
BEWARE: If the approach angle is not shallow enough, the below can happen.
stream
Mooring to a Wall
HW LW
Check there is sufficient depth at LW. Warps should be adjustable from the boat.
If rise and fall of tidal height is expected, the warp length should be three times the range of tide.
Warps may need adjusting as the tide changes. Checking at high and low water is good practice.