[14] On July 5, 2013, HAP set a Guinness World Record for the "longest line of swim rings / tubes" with a total of 620 participants.

[26] Additionally, HAP began work to mitigate a harmful cyanobacterial bloom that became a regular occurrence in the summer inside the Ross Island Lagoon, in partnership with Oregon State University.

Collaborated to develop a concept for a park and ramp design in connection with the proposed Burnside Bridge replacement.

On November 21, 2021, Portland City Council voted to further investigate this park and ramp concept by spending $20,000 to do cost analysis and feasibility.

[42] In 2021, HAP led an effort to remove 25 tons of concrete and rubble from the river's edge of Cathedral Park with help from partners and volunteers.

[43] In 2023, HAP partnered with Green Anchors and other organizations to have 200+ volunteers help remove 100 tons of concrete and rock from the south end of Cathedral Park Beach.

[45][46] HAP's successful activism resulted the city adding "swim at your own risk" signs to Tom McCall Bowl Beach in 2013.

[55] In August 2017, HAP organized a solar eclipse viewing party in innertubes on the river launching from the Fire House Dock.

This was an opportunity to show post Big Pipe completion that the public could even swim in the Willamette River in these traditionally unswimmable months.