Question: When were the Tidal Force and Canyon River Rapids rezoned into the Boardwalk?
About the article "Hersheypark", section "Pioneer Frontier".

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The largest area of the park, Pioneer Frontier, the southwestern-themed section of the park, includes four of the park’s roller coasters: Trailblazer (the second oldest in the park), Sidewinder, Storm Runner, and Fahrenheit.
It also includes the Frontier Flyers, The Howler, Mini Scrambler, and Livery Stables.
It also has its own food court which features a wide variety of restaurants.
The section previously included the area up to and including Tidal Force until 2007 when Tidal Force and Canyon River Rapids were rezoned into the new Boardwalk.
In 2007, Hersheypark celebrated its 100th anniversary.
A fireworks show occurred every weekend, and as another aspect of the celebrations, Hersheypark opened The Boardwalk at Hersheypark, a water park and themed area.
The area filled in the remaining grass area of Midway America.
East Coast Waterworks, a water play area, Coastline Plunge, four water slides, a FlowRider called Waverider, a kiddie wave pool called Bayside Pier, and Sandcastle Cove, a kiddie water play area were opened.
Roller Soaker and Tidal Force were included in the new themed area, as well as Canyon River Rapids, which would be removed following the 2008 season.
With the opening of the Boardwalk, the Canyon River Rapids and Tidal Force queues had their entrances and exits rerouted.
Following the 2007 season, the Western Chute-Out water slides were removed, as Coastline Plunge had effectively replaced them that season.
In Chute-Out's place, Fahrenheit, Hersheypark's 11th roller coaster, built by Intamin of Switzerland.
When it opened, it held the record for steepest drop at a 97 degree angle (commonly referred as a negative drop).
In March 2008, the Hershey Entertainment Complex was certified as Storm Ready by the National Weather Service.
This is awarded to communities and organizations/companies that are prepared for Severe Weather.
The Hershey Entertainment Complex was certified based on their emergency action procedures, emergency evacuation plans and evacuation shelter(s) capability.
The complex contains an extensive system of CCTV Security Cameras, trained security personal and extensive weather spotting and detecting systems.
In 2009, a new section of the Boardwalk was opened, replacing Canyon River Rapids.
It was nicknamed "the SeaQuel" and featured two major water rides - a wave pool, The Shore, and a lazy river, the Intercoastal Waterway.
The SeaQuel also included the addition of cabanas which was an additional cost for use.
The cabanas entrance forced the removal of Rodeo from the park.
Rodeo was relocated to Dutch Wonderland.
As of 2011, The Boardwalk is home to six games, eleven retail centers and thirteen food concessions. 
Congo River Rapids first opened in 1986 named Grand Canyon Rapids and was part of the Aqua Land area of the park.
The entrance to the queueline was originally located where the path to Katanga Canyon starts in Mutiny Bay today, meaning that the ride was hidden from view.
This was changed when Katanga Canyon was built in the centre of the rapids circuit, as part of John Wardley's plan to open up the area.
Katanga Canyon opened in 1992 along with the new Runaway Mine Train.
The Grand Canyon Rapids were rethemed to adopt the African safari theme of the new area, including the change of name to: "Congo River Rapids".
The original boats held six riders, but were exchanged years later for eight seat boats, to increase passenger throughput. 
  Big Eddy: A whirlpool located at the sharp river bend just above downtown Revelstoke.
The locality of Revelstoke was first known as "The Eddy" because of a large swirl in the river which had eroded the right bank of the Columbia here.
Steamboat Rapids: Located just north of downtown Revelstoke, about below Revelstoke Dam; .
Little Dalles Canyon: Located just north of Revelstoke; .
Revelstoke Dam and the southern end of its reservoir Lake Revelstoke are in the canyon.
The name "dalles" implies a rapids.
Eighteen Mile Rapids: Located near the mouth of Park Creek, about downriver of Downie Creek, ; or according to Department of Lands topographic maps pre-dating Revelstoke Dam, near the mouth of Big Eddy Creek on the west and Mars Creek on the east, .
The rapids were submerged by Lake Revelstoke.
Priest Rapids: Located just south (downriver) from Dalles des Morts and about north (upriver) of the mouth of Downie Creek; .
The rapids were submerged in Lake Revelstoke in 1984.
The name comes from the drowning deaths of two French-Canadian priests at the rapids.
Priest Rapids was reputed to be the fastest rapids of the Columbia River, with a current reckoned to be over .
Dalles des Morts (Death Rapids): One of the most hazardous rapids of the Columbia River, located just above Priest Rapids and about north of the mouth of Downie Creek; .
The name dates to 1817 when seven voyageurs wrecked at the rapids and tried to walk to Spokane House, over away.
Only one survived.
A number of other fatal accidents occurred at the rapids, including the drowning of twelve people in 1838.
Today the rapids are submerged in Lake Revelstoke, the reservoir of Revelstoke Dam.
Rock Slide Rapids: Located about downriver of the foot of Twelve Mile Rapids.
Lewis Freeman described Rock Slide Rapids as the narrowest point of the entire Columbia River below Windermere Lake, with a channel width averaging .
The river rushed through the narrows and poured into a "cauldron-like eddy", then into another narrow chute to form the Dalles des Morts.
Today the rapids are submerged in Lake Revelstoke, the reservoir of Revelstoke Dam.
Twelve Mile Rapids: Located just upriver of Dalles des Morts, .
The rapids were submerged by Lake Revelstoke.
Gordon Rapids: Located at the mouth of Ruddock Creek (formerly Gordon Creek), about south of Horne Creek; approximately above the mouth of the Goldstream River, upriver from Dalles des Morts, and below Mica Dam; .
The rapids were submerged by Lake Revelstoke.  
  Cascade Rapids (The Cascades, Grand Rapids, Cascade Falls, Cascades of the Columbia): Located at river mile 146.5 near today's Bonneville Dam in the Columbia River Gorge; at .
The river fell about over approximately , through a channel about wide.
Submerged in 1937 under Lake Bonneville, the reservoir of Bonneville Dam.
See also Bridge of the Gods, Cascade Locks and Canal, Greenleaf Peak, and Table Mountain.
Celilo Falls and The Dalles (many variant names including: The Chutes, Columbia Falls, Great Falls of the Columbia, Five Mile Rapids, Long Narrows, Les Grand Dalles de la Columbia, The Dalles of the Columbia): A series of rapids located between river mile 188 and 200 near today's The Dalles, Oregon in the Columbia River Gorge.
The entire set of rapids was known by various names such as The Dalles and The Narrows.
The river fell about over approximately , through a channel that narrowed to wide in one section.
Rapids and falls within the series included (in order upriver): Threemile Rapids, , The Dalles Rapids (not to be confused with the whole series of rapids), ; Fivemile Rapids, ; Tenmile Rapids, ;, and Celilo Falls, ;.
Except for Threemile Rapids, the entire series of rapids was submerged in 1957 under Lake Celilo, the reservoir of The Dalles Dam.
Threemile Rapids is just below the dam, at the upper end of Lake Bonneville, the reservoir of Bonneville Dam.
See also Celilo Canal, Celilo Village, Oregon, and Wishram village.
Preachers Eddy: Located at river mile 214, , near Rufus, Oregon.
Schofield Rapids: Located at river mile 215, just below today's John Day Dam; at .
It was small and not a significant hazard.
It was submerged in 1957 by the uppermost waters of Lake Celilo, the reservoir of The Dalles Dam.
John Day Rapids: Located between river mile 216 and 218, near the mouth of the John Day River and consisting of two main rapids: the Lower John Day Rapids, at , and the Upper John Day Rapids, at .
The Army Corps of Engineers made efforts to improve navigation at the rapids.
In 1911 a "large reef" was removed from the "middle rapids".
The rapids were submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Indian Rapids: Located at river mile 220, just above the mouth of the John Day River, at .
It was small and not a significant hazard.
When David Thompson visited the rapids on August 2, 1811, he named it Muscle Rapids due to the many shells he found there.
The rapids were submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Squally Hook Rapids: Located at river mile 223, a few miles above the mouth of the John Day River, at .
It was not a major hazard although one commentator described it as "short sharp and savage".
In 1912 the Army Corps of Engineers improved navigation by drilling and blasting rocks at the rapids.
The rapids were submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Rock Creek Rapids: Located near the mouth of Rock Creek, approximately river mile 227 to 228.
Described as "rough and rowdy" but not particularly hazardous.
Blalock Rapids: A very minor rapid, probably located near the railway siding of Blalock at the mouth of Blalock Canyon, approximate river mile 233.
It was submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Owyhee Rapids: A very minor rapid located at river mile 240, , near Arlington, Oregon.
It was submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Canoe Encampement Rapids: A minor rapid located at river mile 265.5, , about below Boardman, Oregon.
In 1912 the Army Corps of Engineers improved navigation at the rapids by removing "two large reefs" and several smaller ones from the center of the channel, which had been a hazard during low-water.
The rapids were submerged in 1971 under Lake Umatilla, the reservoir of John Day Dam.
Umatilla Rapids: A significant rapid, located at what is now McNary Dam, river mile 292, .
There were at least three "riffles", with the third one downstream being the main one.
The total length was somewhat over .
During the low-water seasons, about November to March, Umatilla Rapids became a barrier to steamboat navigation in the late 19th century.
The lesser rapids below Umatilla also became more hazardous; larger boats might not even be able to reach Umatilla Rapids during low-water.
During high-water large boats could operate from Celilo Falls upriver as far as Lewiston, Idaho on the Snake River.
The low-water season effectively suspended river navigation above Umatilla Rapids and on the Snake River.
In 1912 the Army Corps of Engineers described the Upper Umatilla Rapids as having two channels.
The north channel, known as the low-water channel, was "narrow and tortuous at low water, but has been the only available channel".
The south channel, known as the high-water channel, was used only during the high and medium stages of the river.
In 1891 rocks were blasted in Umatilla Rapids to create a passage for steamboats during low water.
Additional work to improve navigation was done in 1910 and 1911.
The rapids were submerged in 1954 under Lake Wallula, the reservoir of McNary Dam.
Parts of the dam were built on top of the lower portion of the rapids.
In 1805 the Lewis and Clark Expedition gave the name Musselshell Rapids due to the numerous mussels.
Homley Rapids (Homly Rapids): A very minor rapid located about below Pasco, Washington.
In 1911 the Army Corps of Engineers described "Homly Rapids" as "the shoalest on the Columbia between Celilo and the mouth of the Snake River", and that the river was divided by numerous islands, with the main channel passing between "islands Nos.
4 and 5".
The Corps made efforts to improve navigation by removing obstructions from the main channel and by building "wing dams" to force more water into the main channel.
The rapids were submerged in 1954 under Lake Wallula, the reservoir of McNary Dam.
Bull Run Rapids: A very minor rapid located a few miles below Wallula Gap.