Swim Clubs

Hidden Hollow and Knowlton Swim Clubs — two clubs for one low price! 

Hidden Hollow and Knowlton Swim Clubs — two clubs for one low price! 


May 30th, 2020 Update:

We are excited by the PA Department of Health's (PA DOH) clarifications issued last week that provided guidance for Summer Recreation camps and pools operating in the "YELLOW" phase.  The guidance gives us the information we need to manage the Covid-19 related risks defined by the PA DOH and still open our clubs. 

We are on target for a June 27th Opening of Knowlton and Hidden Hollow Swim Clubs.  Now that we are permitted to prepare our facilities we are designing the necessary policies to offer a safe facility for our members.  We will continue to assess our ability to open sooner. 

The pools will have to operate very differently than they did in prior seasons. We appreciate your patience as we finalize our Covid-19 plan to comply with the necessary guidelines.

We will be posting Covid-19 policies and membership information by June 5th.

We look forward to continuing to give our members and staff a safe and healthy atmosphere this summer.  Please check back for updates and stay healthy and safe!

What to know

Knowlton Swim Club and Hidden Hollow Swim Club are two clubs that are both quietly nestled in hollows on the farm.  Every member may have access to all facilities and activities at both clubs.  The swim club grounds have plenty of room for picnicking, sunbathing, and lounging in the shade.  Cool off this summer and surround yourself with fun and friends in a beautiful summer setting. 





Knowlton Swim Club features a 25-meter swimmers' pool, a toddlers' pool, an intermediate pool, diving boards, diving platform & slides.  The facility includes a volleyball & basketball court, shuffleboard, tether ball, large picnic area and children's play areas.  

In addition, there are lots of places to soak in the sun or relax in the shade.  The Snack Bar has many choices for lunch, dinner & treats for kids of all ages.



Hidden Hollow Swim Club boasts an impressive selection of pools including a 50-meter Olympic pool, a 25-meter lap pool and a cloverleaf of 3 children's pools: 1', 2' and 3' deep.  Plus slides, diving boards & platforms, including 3-meter, 6.5 -meter and 10-meter platforms that's guaranteed to take your breath away.
(The 6.5 meter was built at the 1965 women's diving competition height.  In 1965 women were not permitted to competitvely dive above 6.5 meter height. )

The grounds have plenty of room for picnicking, sunbathing or lounging in the shade.  Hike on the hiking trail, play in the children's play area or enjoy tennis, basketball, volleyball or wall ball on one of our many courts.  Lunch and dinner are always available at our Snack Bar.     


The Linvill family has operated swim clubs in Middletown Township for over 90 years.  

In the 1920's Arthur Linvill hooked a scoop to a horse and dredged the pond at the bottom of the hollow that is now known as Knowlton Swim Club.  The neighbors loved swimming in the swim hole. After a couple of years Arthur and his neighbors decided to all chip in so they could hire a life guard so it would be safer for the kids to be swimming.  This was the beginning of collecting dues for the club.  In 1928 Knowlton formed its board of directors and officially sold memberships. 

In the early 1960's Knowlton Swim Club had a 3 year waiting list.  Arthur and his two sons, Paul and Larry, worked with an architect and designed the award winning facilities of Hidden Hollow Swim Club. Hidden Hollow Swim Club opened in June of 1965.  

Hidden Hollow won several awards for its amazing design.  
The dive tower was designed to be sure to include women in competition.The  3-meter, 6.5 -meter and 10-meter platform tower is an awesome and unique structure. The 6.5 meter was designed at the 1965 women's diving competition height. (In 1965 women were not permitted to dive above 6.5 meter height. )

  • In 1970 the heated lap pool was added to Hidden Hollow.  (It is no longer a heated pool.)
  • The lap pool is measured 25 meters by 25 yards so it may handle any competition.
  • 1970 began the years of Knowlton's undefeated swim team with Mr. Jones as coach.  
  • 1971 Fred Phillips became manager at Hidden Hollow.
  • In 1980, Knowlton's 25 meter steal pool was rusting through and leaking badly.  Steve Linvill looked at the problem and came up with the solution of fiber glassing the entire pool.  Knowlton was one of the first steal pools to revert to fiberglass.  
  • 2012? installed stainless gutters on the clover leaf at Hidden Hollow
  • 2014 replaced the dives at Hidden Hollow.
  • 2015 we installed stainless steal gutters on the 50 meter pool.
  • 2016 Fred Phillips retires as pool manager.
  • 2017 the dive towers at Knowlton are replaced.