C172 pilot reported a near midair collision in the pattern at apa airport.

Attributes
ACN	1636094
Time
Date	201904
Local Time Of Day	1201-1800
Place
Locale Reference	APA.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Landing
Route In Use	Visual Approach
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 87 Flight Crew Type 87
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Horizontal 150 Vertical 75

Narrative:

[Took] off on runway 17L to join the right hand pattern for touch and goes on 17R. Tower let me know that there was a plane in the pattern above and to my right - I saw a plane turning towards the downwind; so I waited until he was no factor and turned till I was also on the downwind.tower asked me to do s-turns in the pattern (I'm assuming for distancing). A little less than midway; someone made a radio call asking about the plane above them. While in a slight westerly s-turn; I looked down and saw a cessna at 10-11 o'clock about 150 feet horizontal and 75 feet vertical flying the same direction I was.naturally; I turned easterly and slowed down; keeping my eyes on this plane the whole time. He went west and boosted his speed; until he was much further ahead of me.I don't know [if] he was behind the plane I saw and I cut him off by turning for the crosswind too early or if he was entering the pattern at the mid-field downwind and got really close. Tower made no mention of our distancing.

Original NASA ASRS Text

Title: C172 pilot reported a NMAC in the pattern at APA airport.

Narrative: [Took] off on Runway 17L to join the right hand pattern for touch and goes on 17R. Tower let me know that there was a plane in the pattern above and to my right - I saw a plane turning towards the downwind; so I waited until he was no factor and turned till I was also on the downwind.Tower asked me to do s-turns in the pattern (I'm assuming for distancing). A little less than midway; someone made a radio call asking about the plane above them. While in a slight westerly s-turn; I looked down and saw a Cessna at 10-11 o'clock about 150 feet horizontal and 75 feet vertical flying the same direction I was.Naturally; I turned easterly and slowed down; keeping my eyes on this plane the whole time. He went west and boosted his speed; until he was much further ahead of me.I don't know [if] he was behind the plane I saw and I cut him off by turning for the crosswind too early or if he was entering the pattern at the mid-field downwind and got really close. Tower made no mention of our distancing.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.