When should you be aggressive on the river instead of a value bet?

[Van_Broked]

Another one you can do with a non-nut hand is when you hold a big pair. This is a better play in position and on a dry board. Say you have Aces and raise and get it heads up. Flop comes down J73 rainbow and you fire a CB and are called. A lot of the time opponents will call you here with an underpair or a weak J like JT. If the turn bricks and he checks it to you, check behind him. Then, when he checks to you on the river, overbet the pot (unless an A,K or Q hits). You will be surprised how often your "obvious bluff with AK or AQ" gets called by all sorts of weak holdings.

[Zybomb]

Very true. A lot of the time people bluff into you on the river given this action, but in addition alot of opponents call with a wide range of hands if they check and the PFR bet the flop, checked behind on the turn and then bet the river

[Robbr25]

Thanks, this is exactly the kind of examples I was looking for.
My total aggression factor on the river is only 1.21 and am looking to improve it.
I will definitely consider the situations that you have given.