It depends on the power plant: Local enviro reg’s at some plants mean that “extra” cooling is done on the “river water” to get it closer to the “natural” temperatures before it is re-released to the river.
Don’t know if that is a requirement here.
You do lose a lot of cooling capacity at 90 inlet degrees compared to say 70 (nominal) or 45 (winter) inlet temps.
Tell me about it—on my first boat we did a flank run from Japan (31 degree injection temp) to Guam (85 degree injection temp).
The reduction in speed was amazing.