They are just two points off both six and seventh as a host of teams attempt to clinch a play-off spot.
That was more than enough for them to protect in the second half and they are right in the thick of things with five games to go.
They blew Stevenage away with a pulsating first forty five minutes, racing into a 4-0 lead within 40 minutes.
Colchester United continue to hunt down the teams above them in the race for promotion, with their thirteenth home win of the season. Colchester started the half on the from foot and nearly went ahead through a superb strike from Richard Brindley. The wing back was set back by Porter from the angle in the box and his half volley hit the bar and bounced down to safety of the post.
Firstly George Elokobi had a header that comes back off the post, then the ball fell nicely to Sean Murray and his drilled shot was deflected in by Porter to make it 2-0.
This meant Colchester went into half time 4-0 up and in complete control after a dominant first half and plenty to work with in the second period.
Firstly Walker was forced into a save by Jobi McAnuff and then Dickenson forced Chris Day into a smart save as Colchester looked for a fifth. Drey Wright also saw an effort from the edge of the area go just wide of the post.
The U's are now two points off the play-offs and will now turn their attention to their next game as they welcome title chasing Doncaster Rovers to the Weston Homes Community Stadium.