The Rams scored all three of their goals in a seven-minute span of the first half, with Ehrgood getting both of his goals within a minute.
Brandon Johnson had an eight-save shutout for Riverside.
Steven Kalbach scored the winner on a header as Cinnaminson downed Burlington Township, 2-1, in overtime.
Kalbach scored on a header off a free kick that he directed just inside the post.
The Pirates almost won the game in regulation, but Burlington Township's Ian Bennett stopped a penalty kick in the second half.
Colonial Conference. Sophomore Zach Thomas scored the overtime winner for Audubon, as the Green Wave downed Lindenwold, 2-1.
Thomas scored his goal 2 minutes, 30 seconds into extra time off a cross from senior Drew DiPrinzio.
In another Colonial match, Haddon Heights and Haddonfield battled to a 1-1 draw. James Hick scored the lone goal for Haddon Heights, and Ricky Kaulback scored for Haddonfield.
Haddon Heights nearly lost the game in overtime as the ball was rolling along the goal line, but the Garnets cleared it out of harm's way.
Nonleague. Akwasi Adu scored four goals for Atlantic City in a 6-2 victory over Atlantic County Tech.
Adu had a hat trick before halftime.
Atlantic City goalkeeper Juan Elizalde had seven saves, allowing just one goal in each half. Edras Palma tallied two assists for Atlantic City.
Kevin Breeze scored with seven minutes remaining as Gloucester Catholic came back in the second half and defeated Triton, 2-1.
Chris Ferrari scored earlier in the second half to tie the game for the Rams. Goaltender Kyle Nunan made five saves for Gloucester Catholic.
Hammonton improved to 3-1 as Dalton Rudolph scored both goals in a 2-0 shutout of Bridgeton.
Rudolph's two goals were more than enough for Hammonton goaltender Andrew Slater, as he turned away three shots.
Sam Martinez made 13 saves for the Bulldogs.
Zach Porter broke a scoreless tie midway through the second half as Eastern defeated Bishop Eustace, 1-0.
Porter scored on a diving header off a cross from Carlos Valley.
Contact Doug Gausepohl at email@example.com.