Navigable river, about 73 km.

通航河道约73公里。

The river is navigable now.

河开了。

The lower reaches of the river are navigable for steamers.

这河的下游能够行驶轮船。

But 900km will have to be dredged to make the river fully navigable, which would quintuple its shipping capacity.

但是900公里的路途必须要疏浚来使河流保持完全可通行状态，这将使它现在的通航容量提高5倍。

This was a whole new level: far from any settlements and often five days' walk from the nearest stretch of river navigable by boat.

这是一个全新的地方：远离任何居民点，经常要从这条河最近的水域划船行驶5天。