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Mongaup River

Sullivan County, New York · 1 listed access point

For October 18, flow and water temperature are about usual.

Water temp

60 °F

52nd percentile for the date

64 min ago

Flow

130 ft³/s

70th percentile for the date

64 min ago

Directions New York DEC rules Nearby waters

These readings do not say whether fish are biting, whether there is parking, or whether the season is open.

Before you drive

Overnight	24°F, wind 2 mph Clear
Sunday	58°F, wind 3 mph Sunny
Sunday Night	31°F, wind 2 mph Clear
Monday	65°F, wind 0 to 3 mph Sunny

How this water changes through the year

Flow through the yearFlow through the year

Flow, ft³/s. The band is the middle 60% of years for each week; the line is the median. The marker is the current reading, on today's date.

Water temperature through the yearWater temperature through the year

Water temperature, °F. The band is the middle 60% of years for each week; the line is the median. The marker is the current reading, on today's date.

Over 8 years of record, flow on Mongaup River peaks in January, when the median runs about 385 ft³/s, and falls to its lowest in September at around 111 ft³/s. Today's 130 is close to that low. The band on the chart is where the middle 60% of years fall, so a reading inside it is ordinary for the date and one outside it is not.

Nearby monitored waters

Neversink River5 mi · New York · 49 °F · flow about usual Willowemoc Creek13 mi · New York · 46 °F · flow about usual Beaver Kill19 mi · New York · 48 °F · flow about usual

No water here is recommended over another. Same measurements, three closest waters.

Stocking 2011–2025

Fish released by year and speciesFish released by year and species

What DEC released and when. A record of what went in, not a count of what is there now, and not a guide to when fishing is good.

Exact figures by year

Year	Fish released
2025	880
2024	840
2023	830
2022	830
2021	830
2020	620
2019	730
2018	720
2017	690
2016	720
2015	710
2014	730
2013	620
2012	740
2011	710

DEC records 11,200 fish released here in every year the dataset covers, an average of 747 a year, mostly Brown Trout. Stocking says what was put in, not what is there now, and nothing at all about when the fishing is good.

Species

Species DEC lists for this water: Brown Trout. From DEC's recommended fishing waters dataset. DEC stars some names and does not say what the star means, so it is not shown.

Access points

Coordinates	To gauge
41.7213, -74.7095 · Sullivan	11.3 mi

Sources and method

Live: USGS gauge 01433005, MONGAUP R BELOW SWINGING BRIDGE RESERVOIR NY, 11.3 mi from the listed access point. Fetched 2026-10-18 07:19 UTC.
History: USGS daily values: flow 2019–2026, 2,612 daily values; water temperature 2019–2026, 2,586 daily values. Percentile is the share of readings within 7 days of this calendar date, across all years, below the current one (flow n=105 over 7 years, water temperature n=105 over 7 years).
Stocking: New York State DEC open data, 2011–2025, 30 records for this water.
Rules: Seasons, limits and licences are not on this site and are not copied from the agency that publishes them: New York DEC.
Forecast: NOAA National Weather Service, api.weather.gov, for the coordinates of the nearest access point.

Independent presentation of public data. Not affiliated with, endorsed by, or approved by the USGS, NOAA or New York DEC.