Watertown Municipal Airport is a public use airport located in and owned by the city of Watertown, in Jefferson County, Wisconsin, United States. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2025–2029, in which it is categorized as a regional general aviation facility. Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned RYV by the FAA but has no designation from the IATA. Watertown Municipal Airport was the site of the first Transponder Landing System in the United States.

Facilities and aircraft

Watertown Municipal Airport covers an area of 360 acre at an elevation of 833 feet (254 m) above mean sea level. It has two runways: The ROCK RIVER (RYV) non-directional beacon, 371 kHz, is located on the field. For the 12-month period ending May 24, 2021, the airport had 58,000 aircraft operations, an average of 159 per day: 89% general aviation, 9% air taxi and 2% military. In July 2024, there were 60 aircraft based at this airport: 51 single-engine, 7 multi-engine and 2 jet.

Aero park

There is an aero-park, sponsored by the local Marine League, located adjacent to the airport where air operations can be observed. 43.17417°N, -88.7175°W

Gallery