Closure and re-opening

The Wall Street Crash of 1929 took its toll on the park and by 1931 it had gone into foreclosure. For the 1932 season, the park operated only Wednesday through Sunday, and in 1933 it closed. Several attempts to reopen the park failed and it remained closed through 1939, although the grounds were occasionally used for company picnics.^[7] A drive-in movie theater operated in the parking lot from 1937 to 1939.

Edward Carroll Sr. purchased the abandoned park in 1939 and after making improvements, reopened Riverside Park on May 29, 1940.^[8] Carroll is credited with rescuing Riverside and turning it into the largest theme park in New England.^[9] He purchased the plans and cars of the 1939 New York World's Fair Cyclone Roller Coaster and opened a new coaster in 1941.^[10] That coaster, now known as Thunderbolt, is operating at the park and is the oldest coaster — in its original location — within the entire Six Flags chain of theme parks.^[11] The park continued to add new rides and removed some older ones. The theater and bowling alley were removed in the late 1950s, making Riverside Park a seasonal attraction.

Carroll took a liking to auto racing, a sport that was gaining popularity in the Northeast after World War II, and added it to his slate of attractions at Riverside, building the Riverside Park Speedway in 1948, replacing an open-air bandstand.^[12] The 1960s was a popular period for stock car racing at Riverside Park. NASCAR began to hold events at Riverside Park Speedway in 1976.^[13] in 1968 the park added its first steel coaster called the Wildcat and In 1977, Riverside Park added its first looping roller coaster, The Loop Coaster, later known as Black Widow also Edward j Carrol Sr who saved the park in 1939 died in 1979 also in 1979 the former roller rink building that opened in 1916 it was a popular destination for over six decades was demolished to expand the park but the park build a new roller rink building from 1978 thru 1998 when it closed. today the building is now human resources building. but The park continued to be successful throughout the 1970s and the 1980s In 1980 the park invested in an Arrow Development log flume known as Red River Rapids. It became the park's first water ride. It was later renamed Poland Spring Plunge. By the 1980s, the park stopped selling individual ride tickets and began charging a "pay one price" admission.

Six years after the opening of Black Widow, the Wildcat was removed and moved to the late Rocky Point Park in Rhode Island. In 1983, Riverside Park added its third roller coaster, which was also the park's second wooden coaster. The owners originally wanted a coaster exactly like the Coney Island Cyclone, but space was limited, so the coaster would need to take up less space and would have sharper twists and turns. It became known as the Riverside Cyclone.^[14] In 1987, Riverside attempted to build a white-water rafting ride called the Lost River Water Ride. Plagued with problems, the attraction never opened and was subsequently abandoned. A majority of the ride was demolished in 1989 to make way for Wild River Falls, a waterslide complex consisting of three sets of slides: Riptide, Blue Lightning and Pipeline. A popular attraction, Wild River Falls remained in operation until the opening of the Island Kingdom Waterpark in 1997.

In 1994, Riverside partnered with Lady Luck Gaming in a proposal to build a hotel and dockside casino complex at the park, one of several competing casino proposals in the state.^[15] The plan died after Agawam voters rejected a non-binding referendum in support of casino gambling in November.^[16]

Purchase by Premier Parks

During the 1996 season, the track on the Musik Express was damaged and the attraction remained closed for a portion of the year. A Chance Chaos was ordered and was scheduled to open for the 1997 season. During December of 1996, after 57 years owned by the Carroll family Ed Carrol jr was ready to move on and sell his park to Premier Parks of Oklahoma City, Oklahoma, which subsequently purchased the park. Premier Parks renamed the park as Riverside: The Great Escape.^[17]

Under Premier Parks, various changes were made to the park. For the 1997 season, the new owners invested more than $20 million on general improvements and several new attractions. Attractions included the Island Kingdom Waterpark, which featured a children's water play area, various slides and a wave pool. Other attractions included Mind Eraser (later renamed to The Riddler Revenge) and Shipwreck Falls. In the process of renovation, some older rides such as the Bayern Kurve and The Monorail were removed. Main Street U.S.A. was substantially redesigned, and the Southern Center midway was themed to a 1950s city and renamed Rockville. Other improvements included a new entrance plaza and the carousel being renovated and relocated to the front gate. also in February 1997 the Original Entrance that stood at the park for many years and where guests would both drive to the Parking lots and Walk into the park for years was now closed off and demolished to make way for new parking across the street also a new Bridge was built and took guests to the Main Gates and was constructed over the public road main street the Bridge is still at the park today.

In 1998, the park added several attractions including a lazy river, another children's play structure named Hook's Lagoon, a speed slide tower called Cannonball, a family raft slide named Swiss Family Tobaggan and a multi-slide tower called Big Kahuna. The water park expansion was added to the south end of the park next to the park's log flume. The park also added The Hellevator, an S&S Worldwide Turbo Drop tower measuring 21 stories tall, which was originally painted red.

Six Flags

On April 1, 1998, Premier Parks acquired the larger Six Flags chain of parks from Time Warner. The park continued to be known as "Riverside" until the end of the 1999 season. In 1999, the Riverside Park Speedway was removed and the waterpark was doubled in size. Additions included a new slide tower named Shark Attack and a second wave pool called Hurricane Bay. The park added a Hopkins river raft ride named Blizzard River to the North End, replacing a set of dry slides and the old Bumper Cars. Blizzard River was themed to incorporate the Penguin character from the Batman franchise, but the name of the ride was never changed when the park was allowed to use characters from DC Comics on their rides. A new western area called Crack Axle Canyon was added and included four rides, three of which were new to the park. In 2000, Riverside was rebranded "Six Flags New England", reflecting similar changes made at other Six Flags properties. The main street running through the park was renamed "Carroll Drive" in honor of the family that had owned the place for much of its history. The park added a new front gate plaza. On the former site of the racetrack, a new DC Comics-themed section of the park was installed. The area featured several new rides, including Superman – Ride of Steel, a hypercoaster designed by Intamin. And the park added a third coaster called flashback which replaced the Black Widow and Rotor in the north end. Flashback was actually built on the site of the kiddie coaster rolling thunder. Rolling thunder now named great chase replaced the aging Rickie little twister coaster. In 2000. The Poland Spring Plunge log flume ride was removed in 2005 and replaced with Splashwater Falls in 2006.

In 2008, Six Flags New England was to open The Dark Knight Coaster, an indoor MACK Wild Mouse coaster based on the upcoming film of the same name. The park's other Batman-based attraction had its name briefly changed from Batman – The Dark Knight to Batman: The Ride to avoid confusion. However, due to apparent permit issues, the ride was canceled and dismantled, being sent to Six Flags Mexico, which built it in their park. The ride would have cost the park $7.5 million in exchange for bringing $280,000 in taxes for the state of Massachusetts. The cancellation angered the city of Agawam, which stated that issues with the ride were not evident.^[18] The park then announced the new "Glow in the Park Parade". On November 8, 2008, the Town of Agawam allowed Six Flags the right to build roller coasters up to 200 feet (61 m) in height. This paved the way for many future roller coasters in the park.^[19]

The 2010 season brought about the addition of a new children's area: Mr. Six's Splash Island located in Hurricane Harbor. This increased the number of children's areas in the park to four. In 2011, Gotham City Gauntlet: Escape From Arkham Asylum opened up in the DC Superhero Adventure section of the park. This ride replaced the football field and was placed on the same plot of land that the canceled Dark Knight Coaster was supposed to be built on. The same year, the "Mr. Six's" portion of Mr. Six's Splash Island was dropped, effectively renaming the area to Splash Island. In late August 2011, it was announced that Goliath would be coming for the 2012 season. Simultaneously, it was announced that Shipwreck Falls, a water ride located in the North End of the park, would be closing to make way for this attraction. The 2012 season saw the opening of Goliath in the CrackAxle Canyon section of the park as well as a new restaurant in the same area known as JB's Smokehouse.^[20] A month before opening day in 2013, Catapult was unexpectedly removed and scrapped. In May of that same year, a new water ride opened in Hurricane Harbor known as Bonzai Pipelines. At the conclusion of the 2013 season, Taz's DareDevil Dive was closed to make room for New England SkyScreamer, and Twister, an inverting ride located in Rockville, was also removed. At the time of its opening in 2014, New England SkyScreamer was the world's largest swing ride at 408 feet in height. The SkyWay attraction closed forever at the conclusion of the 2014 season.^[21]

On July 20, 2014, Cyclone closed forever.^[22] Construction signs were quickly put up, and during August of the same year, it was announced that Rocky Mountain Construction would transform the ride into a steel hybrid coaster, which would include three inversions and a steeper drop. Wicked Cyclone opened in May 2015.^[23] The 2016 season saw the addition of two new attractions: Fireball and Superman: The Ride. Fireball, a Larson Loop attraction, was installed in the former location of Twister.^[24] Bizarro was transformed back into Superman, including a new red track color and other effects. In 2017, The Joker, a 4D FreeFly coaster, was installed on the former site of SplashWater Falls, which closed in 2016.^[25] MindEraser, the park's SLC received new trains with an updated restraint style. Also during the 2017 season, Superman: The Ride had a limited run of offering Oculus Rift goggles to enhance the ride experience. Buzzsaw closed at the end of 2017. Harley Quinn Spinsanity was installed for the 2018 season, opening in May of that year.^[26] To make room for it, the Tea Cups were moved to the former location of Buzzsaw and is now classified as an attraction in Rockville. The South End was transformed into Gotham City, also seeing the transformation of Mind Eraser into The Riddler Revenge (which received a new green and yellow paint job). For the 2019 season, Cyborg: Hyper Drive, a spinning flat ride, was installed inside the former Hall of Justice building in DC Superheroes Adventures area of the park. This ride is the first to include the fictional character Grid, a sentient cybernetic system and the arch-nemesis of Cyborg, in Six Flags' DC character roster.

For the 2020 season, the park announced the addition of Supergirl Sky Flyer, a Zamperla Endeavour located on the site of the former Kryptonite Kollider, which closed at the end of the 2019 season.^[27] As a result of the park not opening in the 2020 season due to the COVID-19 pandemic, Supergirl Sky Flyer opened in May 2021 in the newly rethemed DC Universe area of the park, which features newly installed superhero statues and freshly painted buildings. Additionally, Goliath was left standing but not operating for the 2021 season and was removed from the park map. In July 2021, a tree fell onto Fireball during a thunderstorm, extensively damaging the attraction and leaving it closed for the rest of the season. Goliath was dismantled and sent to a scrap yard prior to the 2022 season. Before the start of the 2024 season, Kontiki was removed from the park.

Roller coasters

Flat rides

Children's rides

Former attractions