The monitoring network within this area

Hydrionis holds 1,561 values from 5 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

1,561

Values held

1860–2026

Record spans

Gauges within the Youghiogheny huc8 subbasin

5 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 Youghiogheny River at Connellsville, PA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1860–2025.

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	Youghiogheny River at Connellsville, PA (m³/s)
1860	1,331
1888	1,472
1891	1,130
1892	634
1893	589
1894	493
1895	833
1896	1,164
1897	1,351
1898	745
1899	943
1900	799
1902	1,252
1903	909
1904	1,019
1905	833
1906	711
1907	1,540
1908	1,263
1909	541
1910	1,028
1911	960
1912	1,869
1913	1,099
1915	881
1916	1,379
1917	1,416
1918	1,189
1919	790
1920	850
1921	634
1923	510
1924	2,379
1925	592
1926	651
1927	824
1928	1,104
1929	544
1931	606
1932	733
1933	1,328
1934	708
1935	708
1936	2,619
1937	1,560
1939	1,082
1940	1,048
1941	1,801
1942	671
1944	507
1945	923
1946	685
1947	464
1948	790
1949	575
1950	473
1951	671
1952	671
1953	362
1954	507
1956	1,201
1958	564
1959	515
1960	997
1961	861
1962	566
1963	818
1964	968
1965	382
1966	1,082
1967	1,297
1968	651
1969	977
1970	1,002
1971	1,849
1972	1,461
1974	1,022
1975	813
1976	422
1977	637
1978	620
1979	770
1980	513
1981	957
1983	354
1984	957
1985	617
1986	348
1988	592
1989	510
1990	396
1992	283
1993	612
1994	719
1996	1,849
1997	586
1998	532
1999	697
2000	1,005
2001	300
2002	595
2003	668
2004	1,036
2005	1,059
2007	535
2008	790
2010	1,113
2011	634
2013	665
2014	719
2015	1,073
2016	360
2017	680
2018	1,093
2019	697
2020	470
2021	1,025
2022	532
2023	555
2024	1,076
2025	957

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	1860–2025
Completeness	72.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	18 separate periods inside 1860–2025 hold no value. The longest runs from 1861 to 1887 — 27 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1860 and is not continuous from it: 166 years separate the first value from the last, and 73% 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 Laurel Hill Creek at Ursina, 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. 1919–2025.

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	Laurel Hill Creek at Ursina, PA (mm)
1919	658
1920	820
1921	827
1922	497
1923	810
1924	837
1925	673
1926	804
1927	1,109
1928	737
1929	822
1930	419
1931	623
1932	560
1933	774
1934	641
1935	821
1936	961
1937	933
1938	554
1939	657
1940	893
1941	651
1942	850
1943	665
1944	845
1945	923
1946	656
1947	650
1948	874
1949	734
1950	827
1951	805
1952	785
1953	610
1954	766
1955	684
1956	1,042
1957	629
1958	699
1959	693
1960	617
1961	906
1962	689
1963	594
1964	813
1965	560
1966	623
1967	813
1968	650
1969	648
1970	908
1971	1,000
1972	1,144
1973	708
1974	808
1975	977
1976	665
1977	700
1978	811
1979	989
1980	673
1981	779
1982	655
1983	659
1984	844
1985	848
1986	784
1987	636
1988	624
1989	863
1990	965
1991	597
1992	671
1993	769
1994	903
1995	558
1996	1,277
1997	742
1998	629
1999	634
2000	722
2001	547
2002	702
2003	1,078
2004	982
2005	784
2006	670
2007	863
2008	921
2009	714
2010	718
2011	1,039
2012	784
2013	791
2014	647
2015	766
2016	647
2017	1,045
2018	1,468
2019	883
2020	797
2021	715
2022	766
2023	690
2024	797
2025	801

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	1919–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1919 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 Youghiogheny and what each holds
Gauge	Measures	Values	Record
Youghiogheny River at Connellsville, PA	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	339	1860–2026
Laurel Hill Creek at Ursina, PA	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	327	1914–2026
Casselman River at Markleton, PA	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	318	1915–2026
Youghiogheny River at Sutersville, PA	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	294	1920–2026
YOUGHIOGHENY RIVER AT FRIENDSVILLE, MD	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	283	1899–2026

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 — 05020006. 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
Youghiogheny River at Connellsville, 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
Laurel Hill Creek at Ursina, 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
Casselman River at Markleton, 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
Youghiogheny River at Sutersville, 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
YOUGHIOGHENY RIVER AT FRIENDSVILLE, MD	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 4 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	5	yes, 3 or more
Years spanned	167	yes, 20 or more
Values held	1,561	yes, 1000 or more
Distinct measurements	4	yes, 2 or more
Publishers measuring it	1	no
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-03082500.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), Youghiogheny gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-youghiogheny/

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 Youghiogheny 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 confidence2025-05-14

Source: USGS — National Water Information System, USGS site 03082500, 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.