Question: When did Hershey Park get water rides?
About the article "Hersheypark", section "The Hollow".

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A small Ferris wheel and the Airplane Swing were the first two kiddie rides added to the park, both in 1926.
The Skooter were added to the park during the 1920s.
In 1929, a complex of four swimming pools was added, and the original pool was drained.
Because that space was opened up, the old bath house was converted into a funhouse (later called Whoops) and The Mill Chute was installed.
Despite the Great Depression, Hershey Park flourished.
In 1931, the park's first dark ride, The Pretzel, was opened.
In 1933, a penny arcade and a circular ride called The Bug, were installed.
A petting zoo soon followed.
Renovations were made to the Wild Cat roller coaster in 1935 to build up the dips and to more steeply bank the curves.
The 1937 season saw the addition of a Mangel's whip, which was called The Whipperoo.
In 1941, Hershey Park bought a ride from the New York World's Fair, which was an instant success when it opened.
They called it the Aerial Joy Ride, and it marked the last ride the park added until 1945.
Due to the United States entrance into World War II, and the subsequent war rationing, the park was prohibited from adding new rides or attractions.
The Hershey Park Zoo shut down in 1942 as a result of the war as well (and it did not reopen until 1950).
In 1943, Hershey Park remained closed for almost the entire season due to the gas shortages related to the war.
This was the first time the park hadn't been open on Memorial Day or the Fourth of July.
The park remained closed until September 18, when it opened with a show in the Hershey Park Ballroom starring musician Bobby Sherwood.
It was the last time the park hadn't been open on either holiday.
However, the park was able to maintain the rides it had, so they remained in relatively good condition.
However, the Wild Cat was declining throughout the period, and once the war ended, Hershey began to look for the next roller coaster.
In the 1944 season, the park reached an agreement to purchase a used carousel built by the Philadelphia Toboggan Company (PTC) in 1919.
(It still operates in the park today, with music from a 1926 Wurlitzer model #153 Military Band Organ.)
The carousel was the last ride Milton Hershey purchased and saw in operation as he died that year.
However, he had reached an agreement with PTC to build a new roller coaster to replace The Wild Cat for the 1946 season.
It would be the largest roller coaster in the nation. 
Hersheypark (known as Hershey Park until 1970) is a family theme park situated in Hershey, Derry Township, Pennsylvania, United States, about east of Harrisburg, and west of Philadelphia.
Founded in 1907 by Milton S. Hershey, as a leisure park for the employees of the Hershey Chocolate Company, as of 2013, the park is wholly and privately owned by Hershey Entertainment & Resorts Company.
The park has won several awards, including the IAAPA Applause Award.
The park opened its first roller coaster in 1923, the The Wild Cat, an early Philadelphia Toboggan Company coaster.
In 1970, Hershey Park began a redevelopment plan which made the park into the new Hersheypark.
The 1970s brought the first looping roller coaster on the East Coast, as well as a 330 foot tall observation tower, the Kissing Tower.
Beginning in the mid-1980s, the park rapidly expanded.
Between 1991 and 2008, the park added eight roller coasters and a water park.
As of 2011, the park's area covers over , containing over 60 rides and attractions.
The park contains a waterpark called The Boardwalk at Hersheypark, and a zoo called ZOOAMERICA - North American Wildlife Park.
Adjacent is Hershey's Chocolate World, a visitors' center that is open to the public and that contains shops, restaurants, and a chocolate factory-themed ride. 
Through the next several decades, little changed until the late 1960s and 70s when the park's attendance numbers were dropping.
Lake Compounce remained under the ownership of the Pierce and Norton Corporation until 1966, when Edward G. Pierce, Isaac's grandson, sold his interests to the Norton family.
The Nortons continued to own and operate the park through 1985.
During these years, the park made a modest profit and held its own.
No major attractions had ever been added since the 1960s but some of the flat rides came and went over the years.
The Nortons decided to retire and put their park up for sale in 1984.
But they wanted to sell it to someone who would continue to keep it open and not to a real estate developer that would tear the park down and build either a shopping center, apartments, condos, or offices in its place.
This had happened with many classic amusement parks over the decades and still happens today from time to time.
In 1985, Lake Compounce was sold to Hershey Entertainment and Resorts Company (HERCO), which owned and still owns the very successful Hersheypark in the Harrisburg, PA area.
Initially, the park's future seemed promising.
But from 1986 through 1996, Lake Compounce experienced the "decade of the roller coaster."
Financial troubles and empty promises from a string of four owners had severely tarnished the park's image.
During this decade, Lake Compounce had a checkered history, including mountains of unpaid bills, a barrage of lawsuits and a string of unsuccessful turnaround attempts.
Back in 1985, HERCO had huge plans and immediately invested millions to renovate the park and unfortunately ran into trouble and delays.
They did not manage to even open the park for the 1986 season until the first week of July, and even then it was nowhere near complete.
The park then became known as "Hershey Lake Compounce."
The formerly free admission park instituted admission fees and the park was still only partially renovated.
Half the rides did not operate and the Wildcat roller coaster was nonfunctional more often than not.
This led to disappointing attendance numbers.
Before even completing further renovations, Hershey Corporation abruptly backed out in the winter of 1987 and put the park up for sale for next to nothing.
In the spring of 1987, Joseph Entertainment Group (JEG) bought the park at a very low price and renamed it "Lake Compounce Festival Park".
That season the rides were all repaired and ran and at the same time JEG constructed a 20,000 seat outdoor amphitheater.
This was completed by the 1988 season and it hosted several large musical acts.
One of which, was the group Milli Vanilli and in late 1989 during a live performance on MTV, the group gave the first public sign that they were lip-synching, the recording of the song "Girl You Know It's True" jammed and began to skip.
The park broke even for a couple years but was again operating in the red by 1990.
It became apparent that JEG's focus was on concert promotion and the amusement park was neglected.
By 1990, the Wildcat roller coaster was again nonoperational and only a few rides operated and the park focused mostly on concerts.
In 1991, exposing the financial troubles of JEG, the company bounced a check to would be performers Guns N' Roses, who then refused to play.
Later JEG was found to have been almost $1 million behind in taxes and had not refunded ticket-holders for 15 canceled concerts.
JEG eventually filed for Chapter 11 bankruptcy.
The park closed for the season that Labor Day.
It seemed that the park might close forever, but in hopes of saving it, a group led by Steven Barbarino wanted the park to be able to continue its status as the oldest continuously operating amusement park in the United States.
So it did not open in 1992 except for a few days over the Labor Day weekend minus most of the rides but with modest low budget entertainment.
This also occurred in 1993 and 1994, while Mr. Barbarino continued to seek a buyer for the nearly defunct park.
In 1994, the park opened for the July 4th weekend with no rides but a concert with a few regional bands as well as opening the beach for a couple days.
After failing to find a buyer willing to keep the land as an amusement park, Mr. Barbarino's group eventually repurchased the park in the summer of 1994, and immediately sought a new group to manage the park.
Several expressed interest, including Anheuser Busch, Lego, and Funtime Inc.
In 1994, Funtime agreed to manage the park and began full-time operations again on Memorial Day weekend of 1995.
By opening, it was able to get nearly all the rides back in operation, add a few waterslides, and reopen the beach and swimming area.
The park turned a very modest profit by Labor Day, when it would close for the season.
Funtime, however, was bought out by Premier Parks, which had earlier purchased a competitor away called Riverside Park (now Six Flags New England).
Premier Parks opted out of its contract with Lake Compounce to focus on Riverside Park, leaving Lake Compounce in peril once again.
Shortly after, however, companies like Anheuser Busch, Cedar Fair, and Kennywood Entertainment approached Mr. Barbarino's group about an outright purchase. 
The history of Hersheypark begins with the founding of the town of Hershey in 1903.
The owner of the Hershey Chocolate Company surveyed a nearby area of land, which was to become a leisure park for the employees of his chocolate company.
The park opened in 1905, but it wasn't officially opened as an amusement park until April 24, 1907, when the park opened as Hershey Park.
The park slowly added rides until 1923, when the first roller coaster, Wild Cat, was built.
From then on, rides were regularly added, except during World War II.
The park was redeveloped into Hersheypark in 1970, through a multi-phase project.
Since then, the park has added ten roller coasters, expanded to over 110 acres, and features many other attractions including shows with sea lions, well-known acts including Weird Al Yankovic and Duff Goldman from Charm City Cakes in the Hersheypark Amphitheater, and a short-lived laser light show. 
  Thunder River - Hopkins Rides