For several months, the park commissioners faced funding issues,[71][111] and a dedicated workforce and funding stream was not secured until June 1858.[71] The landscaped Upper Reservoir was the only part of the park that the commissioners were not responsible for constructing; instead, the Reservoir would be built by the Croton Aqueduct board. Work on the Reservoir started in April 1858.[112] The first major work in Central Park involved grading the driveways and draining the land in the park's southern section.[113][114] The Lake in Central Park's southwestern section was the first feature to open to the public, in December 1858,[115] followed by the Ramble in June 1859.[99][116] The same year, the New York State Legislature authorized the purchase of an additional 65 acres (26 ha) at the northern end of Central Park, from 106th to 110th Streets.[115][117] The section of Central Park south of 79th Street was mostly completed by 1860.[118]