An important movement, begun before the war, culminating in 1860, and bearing fruit soon after the close of the war, resulted in the establishment of one of Brooklyn's chief objects of pride,—Prospect Park. The actual construction of the park began in 1866, and was steadily continued until 1874.

The laying out and adornment of the park was placed in the hands of a commission, of which J. S. T. Stranahan, always a leading figure in the park movement, was the president. This commission, originally constituted under an act of the Legislature for the laying out, adornment, and management of the park, had its powers and duties increased by succeeding laws, until it had under its control Washington Park, City Park, Carroll Park, the Parade Ground, and all the public grounds appertaining to the city.

In their report for 1868 the commissioners said: "The propriety, if not the absolute necessity, of an extension of Prospect Park at its western angle, so as to allow the principal drive in that direction to be carried out according to the original design, has been repeatedly urged in former reports of the board, and the Legislature was on more than one occasion applied to for permission to make the desired acquisition; but without success. The commissioners have now, however, the pleasure of stating that an act was passed at the last session, authorizing this extension, and directing the board to apply to the Supreme Court for the appointment of commissioners to estimate the value of the land so taken."

The ground under treatment during the year covered by this report represented over two hundred acres. "The finished drives," says this report, "now amount to nearly three miles and a quarter, being a little more than two miles in excess of that which we were able to report last year. Of bridle paths, we have nearly a mile and a half finished or well progressed; and of walks three miles and three quarters are completed, and nearly five additional miles in progress. The very large and continually increasing number of delighted visitors show how thoroughly these walks and drives are appreciated by them. A fine specimen of rustic work has been erected near the main entrance to the park for a summer house; and a vine-covered trellis-work, with seats overlooking the children's play-ground, commands a beautiful sea and island view, and, when covered with the foliage and flowers of climbing plants, will afford grateful shelter to all such as may be disposed to linger in its shade."

The arrangement of the park steadily advanced until it has become one of the most beautiful in the world. Covering 525 acres, its meadows, woodland, lakes, and drives combine to create a picture of remarkable beauty. The lakes cover 50 acres; the woodland, 110 acres; the meadows, 70 acres; the gardens and shrubbery, 200 acres; and there are over 60 acres of water-way. Five and a half miles of main drives were laid out, and minor drives and walks covering a distance of thirteen miles.

The later creation of the Ocean Parkway was a desirable movement, resulting as it did in a driveway running southward from the park to the sea,—a distance of five and a half miles. This magnificent drive is 210 feet wide for its entire length, being subdivided into a main and two minor roadways, with lines of shade-trees to mark the receding lines.

The Parade Ground, adjoining the park on the east, was a popular device. The broad field has contributed an important factor in the summer life of the city, its acres being in constant demand during the out-door season for all manner of sports.

These improvements and others associated with the minor parks of the city have placed heavy obligations on the park commissioners.

A permanent board of water and sewerage commissioners was created by an act of April 2, 1869. The board received exclusive power to cause streets to be repaved, regraded, and repaired; to cause cross-walks to be relaid and sidewalks to be reflagged; and generally to have such other improvements, in and about such streets so to be repaved, regraded, or repaired, to be made, as in their judgment the public wants and convenience shall require. The board held other authority, afterward vested in the board of city works.

The charter of the Nassau Water Company was obtained in 1855. In 1857 the city had acquired all the contracts, property, and rights of the Nassau Company. The thirty-six inch main laid from Ridgewood in 1858 was followed by an additional forty-eight inch main laid in 1867. Three mains have since been added, giving the city water from a drainage area of seventy-four square miles.