have blocked vs are blocking

Sometimes, I don't know which tense to use for example,

Landslided caused by the earthquake have blocked/are blocking a river in
the affected areas, creating two massive lakes which water levels are rising rapidly.

Which tense would you choose? I know it's difficult but could you try to explain your choice?

Also, would you use 'whose' in place of 'which'?

Thanks

It can be both. In fact, in most cases like this both are applicable.
Let's say landslides occured a couple of days ago and so far, the goverment hasn't ordered contractors to clear the river.
So to me, it's a past situation (landslides) leading to the present (river is still clogged). and it's also an ongoing situation (nobody will clear the river in the near future)
That's why I posted this question to see how native speakers pick the preferred tense.

I need to think about the second hint. I'll get back to you in a while

(Edit)

I guess we can use 'with' in place of 'which'

Landslided caused by the earthquake have blocked/are blocking a river in
the affected areas, creating two massive lakes with water levels rising rapidly.

As for 'which'

Landslided caused by the earthquake have blocked/are blocking a river in
the affected areas, creating two massive lakes [in which?] water levels rising rapidly.

Actually I don't see anything wrong with the original which though it sounds a bit odd. Can you give me a hint why the 'which' is wrong?