Pau Gasol (right hamstring) and Luke Walton (back) of the Lakers missed their fourth consecutive games.
The Warriors were without Nelson, who was attending to family business in Southern California. They also had Devean George (sore left knee), Acie Law (sprained left ankle) and Kelenna Azubuike (bone bruise) in street clothes, while Brandan Wright (left shoulder surgery) did not make the trip.
The Lakers didn't arrive at the arena until about 40 minutes before game time, their 50-mile trip from downtown Los Angeles having taken more than 2 1/2 hours because of the usual Southern California traffic and a brush fire.
Bryant scored the first six points of the game and the Lakers took a 17-4 lead midway through the first quarter.
The Warriors shaved the deficit to 29-21 by the end of the quarter, and after consecutive 3-pointers by Morrow keyed a rally against LA reserves, Lakers coach Phil Jackson sent the starters back and they rebuilt the lead to 52-47 at halftime.
Golden State found its rhythm in the third quarter behind Jackson, Andris Biedrins and Ronnie Turiaf and took a 77-73 lead with 1:52 to go in the third period. But Ron Artest's 3-pointer and Shannon Brown's layup off a steal by Jordan Farmar sparked a 9-0 run that gave the Lakers an 84-79 lead entering the fourth quarter.
The game was tied at 98 with 4:28 to play when Powell's layup started an 11-4 run.