Francois Beauchemin lit the lamp with 1:14 remaining in the third period on Thursday to break a 2-2 tie and give Colorado its 10th home win on the season.
Over the past few games, the Colorado Avalanche have ramped up their offense and defense, and its increased effort paid dividends as it defeated New Jersey.
After getting down early into the first period, the Avalanche fought back with great defense and an exceptional performance from Barrie to get the W.
No other team in hockey has their playoff fate yet determined, but with a league-worst 39 points Colorado's is the first to be decided this season.
Coming as no surprise, the University of Denver was the only club to have two players named, in forward Henrik Borgström and defenseman Michael Davies.
"My big thing is we need the consistency in our game," Bednar said. "It's really tough getting motivated as a group to compete at the level we need to."
St. Louis entered Sunday's matchup with Colorado losers of five straight and on the outside looking in for the final Wild Card spot in the West.
With a record of 17-43-3, the Avalanche remain on pace for the lowest point total of the modern shootout era, which began with the 2005-06 season.
The Avs are losing a faster clip than they've ever experienced since moving to Denver. They're also losing by bigger margins than most fans can remember.
In his first appearance since being traded from Vancouver, Alex Burrows led the Ottawa Senators to a 2-1 home win over the Colorado Avalanche on Thursday.