No read on either player in these hands.
River raises are very rarely bluffs from the average player.
My hands are quite strong, but are they strong enough?


Hand 1:

Pre-flop: (5 players) Hero is SB with
UTG calls, 2 folds, Hero calls, BB checks.

Flop: ($30, 3 players)
Hero checks, BB bets $10, UTG calls, Hero calls.

Turn: ($60, 3 players)
Hero checks, BB checks, UTG bets $10, Hero raises to $55, BB folds, UTG calls.

River: ($170, 2 players)
Hero bets $120, UTG raises to $450, Hero ???


Hand 2:

Pre-flop: (5 players) Hero is BB with
2 folds, Button calls, SB calls, Hero checks.

Flop: ($30, 3 players)
SB checks, Hero bets $30, Button folds, SB calls.

Turn: ($90, 2 players)
SB checks, Hero bets $70, SB calls.

River: ($230, 2 players)
SB checks, Hero bets $150, SB raises to $500, Hero ???

These both look like folds to me.

FR I would think both are folds. Not sure about SH but you've shown immense strength in both hands and they're still raising, unless they totally overvalue their hands there's no way you can be ahead since the chance of a bluff is close to 0%.