What is the target altitude at which the initial turn is made after the Portland Low departure?

The correct target altitude at which the initial turn is made after the Portland Low departure is 500' MSL. This altitude is set to ensure the safe and efficient separation of departing aircraft from ground operations and other air traffic.

By adhering to this altitude during the initial phase of the departure, pilots can effectively manage climb rates and maintain safe vertical separation from obstructions such as terrain and other aircraft. The 500' MSL mark serves as a standard that aligns with air traffic control procedures, contributing to overall airspace safety.

In this context, other altitude options do not align with established procedures for the Portland Low departure, making 500' MSL the appropriate choice for ensuring compliance with operational guidelines.