The game began at 10 a.m.as part of a school day promotion.
The RoughRiders allowed the first two goals of the game but scored seven of the final eight, all in the second and third periods. Poturalski scored 56 seconds into the second, then Freddy Tiffels tied the game at the 8:56 mark.
Goals from Marsh, Poturalski and defenseman Ivan Provorov made it a five-goal second for Cedar Rapids. Mark Auk and Jason Kalinowski (empty net) scored in the third period.
Marsh recorded a plus-minus rating of plus-five. Dylan McLaughlin picked up four assists and was plus-four.
Danny Tirone made 29 saves go notch the win in goal. He made his sixth straight start.
The win improved Cedar Rapids' record to 32-19-3, its 67 points good for second place in the USHL's Eastern Conference. Dubuque is three points back of the Riders, with the teams playing Saturday night at Dubuque.
The RoughRiders host Omaha on Friday night.
Here is the official gamesheet: