The new canal, seventy feet wide by seven feet deep, was divided into four sections. The first was from Albany to the eastern end of the Rome summit; the estimated cost of this section for enlargement was $2,864,335.96. The second section ran from east end of Rome summit to Jordan; estimated cost, $1,194,804.74. The third lay between Jordan and Rochester; estimated cost $2,739,139.51. The portion from Rochester to Buffalo comprised the fourth section, its estimated cost being $4,518,575.85. The total estimated cost, after adding ten per cent for contingencies, was $12,448,856.06.[61] Twenty-one double and three single locks were planned between Albany and Schenectady; one double and three single at Little Falls; two double and one single at Syracuse; one single lock at Lyons; two single at Lockville; one double and one single at Macedon. On January 1, 1838, these were all under contract, at a contract price of $3,035,087.[62] One year later contracts to the amount of ten and one-half millions for the whole work of enlargement had been signed. The commissioners were authorized by an act passed April 18, 1839, to borrow four millions.[63] The work went on rapidly. By April 1, 1842, the Rochester aqueduct was completed, at a cost of half a million; the north tier of the locks at Lockport was in use in April of the next year. The total cost of the works here was $610,978. In 1845 twenty-nine out of forty-nine double set of locks between Albany and Syracuse were completed and ninety-eight miles of the new enlarged canal was open for use; the cost for this portion was $3,685,438. The total cost of enlargement contracted for prior to April 1, 1842, was $9,361,442. By 1850 the cost had run up to fifteen millions, which was distributed by years as follows: _Year_ _Expense_ _Year_ _Expense_ 1835 $31,810.70 1844 $418,692.06 1836 53,218.83 1845 155,130.43 1837 636,312.17 1846 70,012.35 1838 1,163,196.12 1847 62,331.30 1839 2,237,785.74 1848 634,573.08 1840 3,234,749.66 1849 1,000,323.97 1841 2,518,309.72 1850 1,365,695.00 1842 1,521,152.51 ------------ 1843 530,801.54 Total $15,634,095.18[64] This enlargement was completed in 1862 and is legally known as the "enlargement of 1862." When completed the canal was 350-1/2 miles long; it had seventy-two locks, measuring 110×18 feet, of which fifty-seven were double and fifteen single. The building of double locks did not cease until 1875.