Dallas' Marvin Chavez moved in and sent a cross to the top of the 18-yard box where George John passed it forward toward the goal, forcing Rimando to make a diving fingertip save.
The game was delayed more than 90 minutes by lightning in the 83rd minute.
Salt Lake (5-1-2) was without injured play-making midfielder Javier Morales.
FC Dallas, meanwhile, was without the services of leading scorer David Ferreira, who has a long-term injury.
Dallas (5-3-3) extended its unbeaten streak to six games with the draw.