| Official Name: | Retsof, New York |
| Settlement Type: | Census-designated place |
| Pushpin Map: | New York#USA |
| Pushpin Label: | Retsof |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Livingston |
| Subdivision Type3: | Town |
| Subdivision Name3: | York |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.17 |
| Area Land Km2: | 1.17 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.45 |
| Area Land Sq Mi: | 0.45 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 326 |
| Population Density Km2: | 279.35 |
| Population Density Sq Mi: | 722.84 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 726 |
| Coordinates: | 42.8353°N -77.8789°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 14539 |
| Area Code: | 585 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 962414 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 36-61236 |
Retsof is a hamlet and census-designated place (CDP) within the town of York in Livingston County, New York, United States. The community, situated southwest of the city of Rochester, is off New York State Route 63 approximately one mile east of State Route 36. As of the 2010 census, it had a population of 340.[2]
It was founded by a man named William Foster, Jr., who reversed the letters of his name to name the town, and it was the site of one of the world's largest salt mines until its collapse in 1994. A new mine, the Hampton Corners mine,[3] is located near Mount Morris, about 10miles to the southeast.
The original population of Retsof was mostly of Italian origin; they lived in a company town where the salt mine owned the houses and a store and maintained the small village. The Italian families lived together with a few non-Italians. The others who were mostly bosses lived on the "Avenue" in nicer houses with indoor plumbing.
In addition to the salt mine, there was a small railroad—the Genesee & Wyoming Railroad (G&W)—that took the salt to the "Main Lines" in neighboring towns. The G&W remains active today as a branch line of the Rochester & Southern Railroad.
Retsof is in northwestern Livingston County, in the southeastern part of the town of York. It is bordered to the east by the hamlet of Piffard and to the west by Greigsville. NY 63 leads southeast from Retsof 4miles to Geneseo, the Livingston county seat, and northwest to Batavia. The hamlet of York is 3miles north of Retsof.
According to the U.S. Census Bureau, the Retsof CDP has an area of 1.2sqkm, all land.[4] The community is drained by Salt Creek, a northward-flowing tributary of Bidwells Creek, which flows northeast to the Genesee River.
In 1994, the Retsof Salt Mine was the largest salt mine in North America, and the second largest in the world. Three hundred people worked within the 6000acres of excavated space, 1000feet below ground, extracting salt from a natural deposit for use as road salt, table salt, and in industry. In March 1994, the ceiling in one of the large underground chambers collapsed, the first of a series of effects caused by groundwater entering the salt deposit, which had been dry for all of the 110 previous years of mining at the site. Over the next 21 months, the mine cavities collapsed and filled with water. Mining operations scrambled to work the accessible areas before the spreading flood, until operations were suspended when the mine was fully filled with water, in 1995. The effect of filling all this space lowered the aquifer, leaving many drinking water wells dry, and led to surface subsidence, even sinkholes 200feet wide, damaging structures and highways. 8feet or 9feet of additional subsidence is expected to take place over the next century.[3]
The U.S. Geological Survey studied the effects of the mine collapse on groundwater hydrology in the surrounding watershed.[5]