Why Britain would avoid taking Warrior up rivers

Would HMS Warrior take the fight to USS Monitor on the Mississippi River or near New Orleans?

Probably not: Britain would keep ocean warships where their advantages mattered and rely on local Confederate vessels for river and coastal work.

The answer separates blue-water and riverine roles. Moving Monitor to the Mississippi would itself require a hazardous coastal transit or an overland transfer. Warrior and other Royal Navy ships could escort merchant traffic to an offshore hand-off point without surrendering their advantages in speed and sea room. Confederate monitors, steamers, or Virginia-like armoured craft would be better suited to carry that protection through narrow and shallow waters. Britain could thus help reopen Gulf trade without sending its most valuable ocean ironclads into terrain where local vessels and forts dictated the engagement.