Question: Who designed the rollercoaster that replaced Mill Race?

Context paragraphs:
Narborough Watermill: The Watermill is built from red Norfolk brick over three storeys in six bays to the west elevation.  Four of the six bays are recessed within giant enclosing arches.  The arches are semicircular headed with raised ashlars and a Keystone.  In the center of the west elevation of the mill there is a timber lucam (covered sack hoist) of shiplap construction.  In front of the west elevation there is a bridge with a three centered arch through which the mill race flows.  The bridge has a parapet wall.  The rear east elevation is constructed with weatherboard cladding with a continuous first floor outshoot which houses machinery of the mill.  Below this there are sluice gates beneath a three centered archway.  The ground and first floor of the mill still contains the Mill wheel and the machinery all which are now listed.  The surviving machinery includes a 13 ft wheel driving pit-wheel and wallower.  There is a horizontal mainshaft that once drove 6 pairs of stones, although there are only five that now survive.The mill race still flows through under the building.

Island Historic District: The Island Historic District is a mixed commercial and residential historic district located in Plainwell, Michigan.  It is roughly bounded by Bannister Street to the north, Hill Street to the south, the Kalamazoo River to the east, and Park Street to the west, as well as including properties along Main Street south of the mill race and along Bridge Street west to the mill race.  The district was listed on the National Register of Historic Places in 1991.

Mill Race (log flume): Mill Race was a log flume ride that operated between 1963 and 1993 at the Cedar Point amusement park in Sandusky, Ohio.  When it opened in 1963, Mill Race was only the second such log flume ride to ever operate in the world (the first being El Aserradero [The Sawmill] at Six Flags Over Texas, which had opened earlier that same year).  Mill Race was ultimately removed from the park in 1993 to prepare for the opening of Raptor in 1994.

Goblintown Mill: Goblintown Mill, also known as Turner's Mill, Wood's Mill, Walker's Mill, and Martin's Mill, is a historic grist mill complex located near Stuart, Patrick County, Virginia.  The mill dates to the 1850s, and is a two-story, timber frame building on a dry stone foundation.  The mill retains its original mill race and milling machinery.  Associated with the mill is a 1 1/2-story, frame "storehouse" that housed a general store and dwelling.  It was built about 1902.

Amos Chase House and Mill: The Amos Chase House and Mill are a historic property on New Hampshire Route 114, just south of the Piscataquog River in Weare, New Hampshire.  The house is a 2-1/2 Greek Revival two-family house built c. 1836.  It has two similar five-bay facades (southeast and northeast) with central entries framed by pilasters and topped by architraves.  The adjacent mill building is also a wood-frame structure, built c. 1849.  Both buildings have seen only modest and superficial alteration since their construction.  The mill is the only surviving 19th-century mill building in Weare, out of a cottage industry that once saw a dozen or more such buildings.  This mill was the only one in the town to survive the New England Hurricane of 1938, although its waterwheel was washed away.  The mill race providing water to the mill from the Piscataquog is still visible on the property, as is a dam built by Chase.  Chase was a tool manufacturer; his son later used the mill in the manufacture of baskets.

Priest Mill: Priest Mill is a historic sawmill and early electric power plant located near Franklin, Pendleton County, West Virginia.  It was built in 1900, with an addition built in 1916 to house a generator and hydro-electric power plant.  Electric power was generated at the mill starting in 1911, and in 1913, the Priest's home became the first in Pendleton County to have electric lights.  It replaced a mill that was destroyed by fire in 1899.  It is a three-story, "T"-shaped, unadorned wooden structure.  originally covered with wood shingles, but these were later replaced by metal roofing.  The mill race measures 988 feet from the headgates at the dam to the entrance under the mill.  It operated as a wool carding mill until the 1950s, and reopened in the 1980s.

Raptor (Cedar Point): Raptor is a steel inverted roller coaster designed by Bolliger & Mabillard at Cedar Point in Sandusky, Ohio, United States.  When built in 1994, it broke many records and held many firsts when it opened.  Instead of having a short layout designed to fit into a compact area like , Raptor was designed with a larger, 3,790-foot (1,160 m) layout, making it the tallest, fastest and longest inverted roller coaster in the world when it opened.  It features six inversions, including a cobra roll, a first for inverted roller coasters.  At its opening, it was the largest investment in Cedar Point history.  The ride is themed as a bird of prey.

Painter-Bernatz Mill: Painter-Bernatz Mill, also known as the Old Stone Mill, is a historic building located in Decorah, Iowa, United States.  The original part of the mill was constructed by William Painter in 1851, and it was expanded to its present size in the next year or two.  A mill race was constructed from a dam on the Upper Iowa River, and it was routed beneath the building to power the turbine.  It was the first of at least 15 mills that used this river as its source of power.  The lower two floors are composed of native limestone.  The original hip roof was removed sometime between 1874 and 1890 and the present gable roof was built giving the mill a large loft.  Diesel power replaced water power in 1947.  The building continued to operate as a mill until 1964.  It became a part of the Vesterheim Norwegian-American Museum in 1971, and houses exhibits on agriculture and industry.  It is also a site in the Silos & Smokestacks National Heritage Area.  The former mill is the oldest building in Decorah.  It was listed on the National Register of Historic Places in 1974.

Reed's Mill: Reed's Mill is a historic grist mill and national historic district located at Secondcreek, Monroe County, West Virginia.  The district includes two contributing buildings and eight contributing structures.  It was one of the original mill complexes of Secondcreek.  The main mill building was built about 1791, and is a mortise and tenon frame structure held together with wooden pins, and sits atop a raised cut stone basement.  A tall three-story section with basement was added in 1949.  The district also includes the mill dam, wing-dam, mill race lined with rock and ending in the mill pond, and concrete mill race that carries water to the turbine (1872) which operates the grinding wheels in the mill.  It remains an operating mill.

Valley Falls Mill: The Valley Falls Mill is an historic textile mill complex on Broad Street in Central Falls, Rhode Island.  The complex consists of the primary mill building, a large Italianate brick four-story building erected in 1849, several outbuildings.  a dam across the Blackstone River, and a portion of the original canal system which provided water power to the mill.  The outbuildings include the gatehouse controlling waterflow into the canals, a small stuccoed office building now serving as a retail establishment, and a brick bath house built c. 1870 that stands just south of the mill race.  The complex originally had a second mill building and power canal; that building was destroyed by fire, and its canal was filled in.  The main mill building was developed as housing in the late 1970s, including a sympathetic replacement for the second mill building.

Supporting paragraphs: Mill Race (log flume) Raptor (Cedar Point)
Answer: Bolliger & Mabillard