Never overestimate yourself. My respect for these rivers has been growing year by year.
4°C cold and gray glacier rivers should be enjoyed with precaution, you can not see to the bottom.
Glacier rivers usually have quite high flow velocities.
Should the glacier river look too dangerous to cross, wait till the next morning, most of these rivers run shallow in the early hours
Wait, if possible, for a jeep to cross first and observe the depth and currents. If you get offered a lift over a dangerous river, accept it!
The depth is usually less up and downstream of the jeep fords.*
Freshwater rivers are usually around 8°C and can be crossed relatively easily at depths up to 60 cm, given that the current is not to strong
Always keep your bike on your down stream side. That way it won´t get pushed at you if things go bad.**
Never cross perpendicular to the current, cross at a 45° angle, heading upstream, that way the lateral forces will be less***