PA28 pilot reported an near midair collision with traffic that ATC had reported.

Attributes
ACN	1637260
Time
Date	201904
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach Descent
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Person 1
Function	Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 12 Flight Crew Total 6900 Flight Crew Type 3500
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 250

Narrative:

In descent for visual to ZZZ on IFR flight plan from 3;000 feet. ATC cleared for visual and reported traffic. Did not see traffic until it approached from my nine o'clock; passed under me 250 feet below. [There were] 3 different radio frequencies in use. Aircraft departing ZZZ use 122.9 then switch to 132.775 until clear of [tfr]. IFR traffic use either 124.55 or 119.7 until cleared for local frequency 122.9. Other aircraft would have departed ZZZ on [a southeast] heading then turn east in climb towards my position. I had no time for evasive action once I spotted other aircraft. I had lights on and wing and tail strobes flashing.

Original NASA ASRS Text

Title: PA28 pilot reported an NMAC with traffic that ATC had reported.

Narrative: In descent for visual to ZZZ on IFR flight plan from 3;000 feet. ATC cleared for visual and reported traffic. Did not see traffic until it approached from my nine o'clock; passed under me 250 feet below. [There were] 3 different radio frequencies in use. Aircraft departing ZZZ use 122.9 then switch to 132.775 until clear of [TFR]. IFR traffic use either 124.55 or 119.7 until cleared for local frequency 122.9. Other aircraft would have departed ZZZ on [a southeast] heading then turn east in climb towards my position. I had no time for evasive action once I spotted other aircraft. I had lights on and wing and tail strobes flashing.

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.