The monitoring network within this area

Hydrionis holds 1,011 values from 3 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

Gauges

1,011

Values held

1903–2026

Record spans

Gauges within the Middle Delaware-Mongaup-Brodhead huc8 subbasin

3 monitoring points, positioned as the publisher records them.

Flood peaks, as measured

This gauge's flood record, as measured. Unlike a daily mean it is the discharge at the moment the river was highest, which is the figure flood frequency analysis is built on.

Largest measured flow of each year at DELAWARE RIVER AT PORT JERVIS NY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1903–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Published by the gauge's own operator from its sub-daily record; Hydrionis stores the figure rather than recomputing it. A year the gauge did not cover produces no value rather than a low one, and the gaps are stated below the chart. A peak is a property of this gauge and its reach: a larger flood upstream or downstream of it is not in this series.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	DELAWARE RIVER AT PORT JERVIS NY (m³/s)
1903	5,805
1905	1,608
1906	1,552
1907	971
1908	2,175
1909	1,637
1910	2,019
1911	1,373
1912	1,348
1913	2,832
1914	3,002
1915	1,280
1916	1,722
1917	1,526
1919	603
1920	2,330
1921	1,807
1923	1,693
1924	1,835
1925	2,764
1926	1,096
1927	2,050
1929	1,801
1930	833
1931	994
1932	1,254
1933	2,888
1934	2,832
1936	3,879
1937	1,317
1938	2,860
1940	3,200
1942	3,964
1943	1,317
1945	1,450
1946	1,393
1947	1,883
1948	2,721
1950	1,756
1951	2,588
1952	2,294
1954	1,068
1955	6,598
1957	1,201
1959	2,186
1960	2,025
1961	1,883
1962	1,600
1963	1,812
1964	1,906
1965	521
1966	623
1967	745
1968	1,002
1969	1,263
1970	1,164
1971	677
1972	1,305
1973	3,058
1975	1,580
1976	1,600
1977	2,180
1978	1,767
1979	1,603
1980	1,710
1982	971
1983	2,059
1984	2,390
1985	1,917
1986	2,888
1987	1,733
1988	855
1989	1,430
1990	1,410
1991	748
1993	1,750
1994	1,385
1995	631
1996	3,794
1998	1,172
1999	1,342
2000	1,005
2002	719
2003	1,317
2004	4,276
2005	4,701
2006	5,352
2007	1,506
2008	1,792
2010	1,305
2011	2,718
2012	1,226
2014	1,184
2015	850
2016	1,090
2017	1,169
2018	875
2019	1,240
2020	1,039
2021	2,701
2023	1,277
2025	1,243

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1903–2025
Completeness	82.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	21 separate periods inside 1903–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1903 and is not continuous from it: 123 years separate the first value from the last, and 83% of the years between them are held. The span is not the record.
Last read from the publisher	2026-10-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

How much of the rain came back out

A discharge in cubic metres per second cannot be compared with anything: the larger number may only mean the larger catchment. Divided by the area draining to the gauge it becomes a depth of water over that land, which answers a question a reader already has — of the rain that fell here, how much came back out as river?

Water leaving the catchment above Bush Kill at Shoemakers, PA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1909–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Computed by Hydrionis from the published annual mean flow and the catchment area the station's own publisher states. It is not a water balance: the difference between rainfall and runoff is not evaporation alone but also change in groundwater storage, water abstracted and taken elsewhere, and water imported by transfer schemes — which is why a catchment can yield more runoff than the rain that fell on it without anything being measured wrongly. A different area figure rescales every value here by the ratio between them.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	Bush Kill at Shoemakers, PA (mm)
1909	665
1910	635
1911	804
1912	650
1913	624
1914	538
1915	689
1916	852
1917	774
1918	678
1919	880
1920	955
1921	622
1922	621
1923	506
1924	704
1925	656
1926	649
1927	1,034
1928	898
1929	717
1930	472
1931	416
1932	646
1933	691
1934	648
1935	692
1936	741
1937	806
1938	777
1939	503
1940	785
1941	428
1942	975
1943	558
1944	514
1945	1,030
1946	518
1947	830
1948	624
1949	502
1950	772
1951	916
1952	1,052
1953	695
1954	512
1955	947
1956	695
1957	484
1958	767
1959	574
1960	769
1961	604
1962	497
1963	425
1964	491
1965	311
1966	437
1967	682
1968	593
1969	667
1970	712
1971	738
1972	1,085
1973	1,009
1974	826
1975	847
1976	760
1977	784
1978	767
1979	1,049
1980	429
1981	554
1982	559
1983	891
1984	719
1985	547
1986	728
1987	749
1988	459
1989	743
1990	849
1991	503
1992	609
1993	760
1994	916
1995	489
1996	1,116
1997	427
1998	621
1999	518
2000	634
2001	456
2002	670
2003	1,108
2004	919
2005	934
2006	1,003
2007	705
2008	980
2009	734
2010	722
2011	1,438
2012	643
2013	646
2014	654
2015	607
2016	471
2017	558
2018	1,316
2019	896
2020	693
2021	952
2022	738
2023	777
2024	712
2025	476

About this series

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Derived Computed by Hydrionis
Period held	1909–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1909 to 2025 is held.
Inputs last read	2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date	2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds within this area

Gauges within the Middle Delaware-Mongaup-Brodhead and what each holds
Gauge	Measures	Values	Record
Bush Kill at Shoemakers, PA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	386	1908–2026
Flat Brook near Flatbrookville NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	343	1923–2026
DELAWARE RIVER AT PORT JERVIS NY	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	282	1903–2026

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 02040104. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
Bush Kill at Shoemakers, PA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Flat Brook near Flatbrookville NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
DELAWARE RIVER AT PORT JERVIS NY	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	3	yes, 3 or more
Years spanned	124	yes, 20 or more
Values held	1,011	yes, 1000 or more
Distinct measurements	5	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-01439500.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Middle Delaware-Mongaup-Brodhead gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-middle-delaware-mongaup-brodhead/

Cite Hydrionis where you rely on values Hydrionis computed, on the method that produced them, or on the compilation itself. The underlying measurements remain the publishers’ and their attribution requirements apply to you directly.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Middle Delaware-Mongaup-Brodhead gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where these figures come from

MeasuredHigh confidence2025-05-09

Source: USGS — National Water Information System, USGS site 01439500, annual peak streamflow. Licence: Open.

Method: The instantaneous maximum discharge of each water year as published by USGS, dated to the day it occurred. One value per October-to-September water year; where the publisher lists both a systematic and a historic peak for a year, the larger is the annual maximum. Values the publisher marks as maximum daily averages are not held here, because they are not instantaneous peaks. Values marked as bounded rather than measured are held as censored observations carrying the bound. Cubic feet per second are converted to cubic metres per second and the publisher unit is recorded alongside.

Rating curves are extrapolated at extreme discharges, so the largest values in a peak series carry the largest measurement uncertainty. Data from the U.S. Geological Survey National Water Information System, a work of the United States government and therefore in the public domain.

Retrieved 1 October 2026.