U.S. Department of the Interior

U.S. Geological Survey

Data Series 497

Prepared in cooperation with the New York City Department of Environmental Protection

U.S. Geological Survey Catskill/Delaware

Water-Quality Network:

Water-Quality Report Water Year 2006
Cover. Photograph shows Biscuit Brook tributary in the Catskill Mountains of New York.
U.S. Geological Survey Catskill/Delaware 

Water-Quality Network: Water-Quality 

Report Water Year 2006

By Michael R. McHale and Jason Siemion

Prepared in cooperation with the 

New York City Department of Environmental Protection

Data Series 497

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2010

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Suggested citation:

McHale, M.R., and Siemion, Jason, 2010, U.S. Geological Survey Catskill/Delaware water-quality network: 

Water-quality report water year 2006: U.S. Geological Survey Data Series 497, 36 p., at 

http://pubs.usgs.gov/ds/497/.
iii

Contents

Abstract...........................................................................................................................................................1

Introduction.....................................................................................................................................................1

Network Description ............................................................................................................................1

Schoharie Watershed .................................................................................................................1

Ashokan Watershed....................................................................................................................3

Cannonsville Watershed.............................................................................................................3

Pepacton Watershed ..................................................................................................................3

Neversink Watershed .................................................................................................................3

Rondout Watershed.....................................................................................................................5

Climate Summary...........................................................................................................................................5

Methods...........................................................................................................................................................5

Field Methods........................................................................................................................................5

Laboratory Methods.............................................................................................................................5

Statistical Methods...............................................................................................................................6

Water-Quality Station Summary..................................................................................................................7

References Cited..........................................................................................................................................36

Figure

1. Map showing the New York City Catskill/Delaware Water Supply System and 

locations of water-quality sampling stations and streamgaging stations on selected 

streams in New York ....................................................................................................................2

Table

1. Characteristics for water-quality stations in or associated with the U.S. Geological 

Survey Catskill/Delaware Water Quality Network in the Catskill Mountains, 

New York ........................................................................................................................................4
iv

Conversion Factors, Datum, Abbreviations, and Units

Inch/Pound to SI

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

acre 0.4047 hectare (ha)

square mile (mi2

) 259.0 hectare (ha)

square mile (mi2

) 2.590 square kilometer (km2)

Flow rate

foot per second (ft/s) 0.3048 meter per second (m/s)

cubic foot per second (ft3

/s) 0.02832 cubic meter per second (m3/s)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

 °F=(1.8×°C)+32

Elevation data is referenced to the North American Vertical Datum of 1988.

Horizontal coordinate information is referenced to the North American Datum of 1983 

(NAD 83).

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius 

(μS/cm at 25°C).

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) 

or micromoles per liter (μmol/L).
v

ABBREVIATIONS

Abbreviation Parameter or constituent

pH pH is the negative logarithm of the hydrogen ion concentration

ANC Acid neutralizing capacity

Spec Cond Specific conductance

Temp C Water temperature in degrees Celsius

Ca2+ Calcium

Mg2+ Magnesium

Na+ Sodium

K+ Potassium

NH4

+

 Ammonium

Cl- Chloride

NO3

-

 Nitrate

SO4

2- Sulfate

SiO2 Silicon dioxide

DOC Dissolved organic carbon

Al Aluminum

Almono Total monomeric aluminum

Alorg Organic monomeric aluminum

Altd Total aluminum

TDP Total dissolved phosphorus, total phosphorus filtered through a 

0.4 micron filter

SRP Soluble reactive phosphorus

TP Total phosphorus, unfiltered, acidified with 1 Normal sulfuric acid

TN Total nitrogen, unfiltered

SSC Suspended sediment concentration
vi

UNITS

Variable Units

pH pH units

ANC Microequivalents per liter

Spec Cond millisiemens

Temp C Water temperature in degrees Celsius

Ca2+ milligrams per liter

Mg2+ milligrams per liter

Na+ milligrams per liter

K+ milligrams per liter

NH4

+ milligrams per liter

Cl- milligrams per liter

NO3

- milligrams per liter

SO4

2- milligrams per liter

SiO2 milligrams per liter

DOC milligrams per liter

Al milligrams per liter

Almono milligrams per liter

Alorg milligrams per liter

Altd milligrams per liter

TDP milligrams per liter

SRP milligrams per liter

TP milligrams per liter

TN milligrams per liter

Turbidity nephelometric turbidity units (ntu)

SSC milligrams per liter
Abstract

The U.S. Geological Survey operates a 60-station 

streamgaging network in the New York City Catskill/Delaware 

Water Supply System. Water-quality samples were collected 

at 13 of the stations in the Catskill/Delaware streamgaging 

network to provide resource managers with water-quality 

and water-quantity data from the water-supply system that 

supplies about 85 percent of the water needed by the more 

than 9 million residents of New York City. This report 

summarizes water-quality data collected at those 13 stations 

plus one additional station operated as a part of the U.S. 

Environmental Protection Agency’s Regional Long-Term 

Monitoring Network for the 2006 water year (October 1, 

2005 to September 30, 2006). An average of 62 water-quality 

samples were collected at each station during the 2006 water 

year, including grab samples collected every other week and 

storm samples collected with automated samplers. On average, 

8 storms were sampled at each station during the 2006 water 

year. The 2006 calendar year was the second warmest on 

record and the summer of 2006 was the wettest on record for 

the northeastern United States. A large storm on June 26–28, 

2006, caused extensive flooding in the western part of the 

network where record peak flows were measured at 

several watersheds.

Introduction

The U.S. Geological Survey, in cooperation with the 

New York City Department of Environmental Protection 

(NYC-DEP) and other agencies, operates a network of 

60 streamgaging stations throughout the New York City 

Catskill/Delaware Water Supply System. In 1997, 13 of those 

stations were selected for a water-quality network to provide 

water-quality data at sites throughout the Catskill/Delaware 

Water Supply System. The four main tasks associated with 

the network are (1) collect stream water-quality samples, 

(2) analyze the water chemistry of the samples, (3) make 

the water-quality data available to NYC-DEP, and (4) 

evaluate the effects of land use and land cover on the water 

quality of streams in the region, identify potential sources of 

contamination, and quantify trends in water quality throughout 

the network. Although data collection, laboratory analyses, 

and data dissemination to NYC-DEP are essential components 

of the project, the goal of the project is to quantify the effect 

of NYC-DEP’s watershed management program on surfacewater quality and to determine the effects of land use on water 

quality in the region. The purpose of this report is to present 

data from 13 water-quality network stations and one Regional 

Long-Term Monitoring station in the Catskill/Delaware 

Water Supply System. The data were collected during water 

year 2006 (October 1, 2005, to September 30, 2006) and are 

presented in tables and hydrographs.

Network Description

The New York City Catskill/Delaware Water Supply 

System is located in the Catskill Mountains in southeastern 

New York (fig. 1). The system includes six surface-water 

reservoirs that supply about 85 percent of the drinking water 

to 9 million users in New York City. The streamgaging 

network is used to quantify the amount and the timing of water 

entering the reservoirs from different areas of the watershed. 

The water-quality network uses a nested design with small 

forested watersheds (“upper nodes”) nested in larger multiple 

land use watersheds (“lower nodes”). The effect of land use 

on water quality can be assessed by examining differences in 

water quality between the upper and lower nodes as affected 

by the intervening land use. These data can also be used to 

investigate trends in water quality that are caused by changes 

in atmospheric deposition, climate, and land use. Waterquality stations are located in five of the six Catskill/Delaware 

reservoir watersheds.

Schoharie Watershed

Two water-quality stations are located on Batavia Kill 

which drains to Schoharie Creek about 3 mi upstream from the 

Schoharie Reservoir. The lower node station is Batavia Kill at 

Red Falls near Prattsville (USGS station number 01349950, 

site 1) and its corresponding upper node station is Batavia Kill 

U.S. Geological Survey Catskill/Delaware Water-Quality 

Network: Water-Quality Report Water Year 2006

By Michael R. McHale and Jason Siemion
2 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

Figure 1. The New York City Catskill/Delaware Water Supply System and locations of water-quality sampling stations and streamgaging stations on selected streams in New York. (Numbers of water-quality sites coincide with numbers in table 1)

Cannonsville Watershed

Pepacton Watershed

Neversink Watershed

Rondout Watershed

Ashokan Watershed

Schoharie Watershed

1

2

13 14

11

12

10

3

9

4

6

8

7

5

ULSTER

DELAWARE

SULLIVAN

GREENE

OTSEGO

SCHOHARIE

ALBANY

CHENANGO BROOME

West Branch De al ware River

East Kill

Schoharie Creek

Batavia Kill

Platte Kill

East r B na Dhc wal e ra e R vi er

Bear Kill

West Kill

Dry Brook

aE s Bt or ok

Rondout Creek

e R d K li l

Elk Creek

Little Delaware River

West Brook

Esopus Creek

Town Brook

Neversink River

Kerrs Creek

Third Brook

Stony C ol ve Creek

Peaks Brook

Dr dy ne r B oo k

Betty Brook

Falls Creek

Trout Creek

Fall Brook

r B u hs Brook

Pines Brook

Lake Brook

Emory Brook

Lewis Creek

Fish Brook

Little West Kill

Sherruck Brook

Hun et rsf ei dl Creek

Red Brook

Chase Brook

Johnny Brook

Coulter Brook

Bobs Brook

Holliday Brook

Huckleberry Brook

Mallory Brook

Barkaboom Stream

Johnson Hollow Brook

Barbour Brook

Beers Brook

Gooseberry Creek

Beers Brook

t aB va ai Kill

Dry Brook

Bear Kill

74° 75°

42°30'

42°

72° 76°

42°

NEW YORK STATE

0 10 KILOMETERS 50 5 10 MILES 2.5

EXPLANATION

Catskill ParkReservoirsStreams

! U.S. Geological Survey Water Quality Stations! Catskill/Delaware Streamgaging Stations

45°
Introduction 3

near Maplecrest (USGS station number 01349840, site 2). 

Batavia Kill near Red Falls (01349950) has been in operation 

since October 1997 and is located 2.2 mi southeast of 

Prattsville in Greene County, N.Y. The watershed is 80 percent 

forested, 19 percent agricultural, and 1 percent residential/

commercial (table 1), including the town of Windham, 

the Windham Ski Resort, and the Windham Country Club 

golf course. Batavia Kill near Maplecrest has also been in 

operation since October 1997 and is located 4.1 mi northeast 

of Maplecrest in Greene County, N.Y. Batavia Kill near 

Maplecrest watershed is 100 percent forested most of which is 

designated as New York State Forest Preserve.

Ashokan Watershed

There are three water-quality stations in the Ashokan 

Reservoir watershed. The lower node site is Stony Clove 

Creek near Phoenicia (USGS station number 01362380, 

site 3), its corresponding upper node site is Hollow Tree Brook 

at Lanesville (USGS station number 01362342, site 4), and 

the third site is Beaver Kill Tributary above Lake Hill (USGS 

station number 01362465, site 5) (fig. 1). The Stony Clove 

Creek station has been in operation since February 1997 and 

is located about 1.3 mi upstream from Phoenicia in Ulster 

County and about 1.5 mi upstream from the confluence of 

Stony Clove Creek and Esopus Creek. The watershed is 

98 percent forested and although there are no towns or 

villages, residences are located throughout the watershed. 

A streambank stabilization and restoration program was 

completed in Stony Clove upstream from the station in 

2005. The Hollow Tree Brook station has been in operation 

since October 1997 and is located 1 mi upstream from the 

confluence of Hollow Tree Brook and Stony Clove Creek in 

Greene County; the watershed is 100 percent forested. The 

Beaver Kill Tributary station is located in Ulster County about 

1.2 mi north of Lake Hill. There are a few residences located 

within the watershed, but it is 99 percent forested. The 

Beaver Kill Tributary station is not paired with any lower 

node station; the gage was added to the network in 2001 in 

anticipation of a forest harvesting project planned for the 

watershed. That project was never carried out, but the station 

provides data that can be compared to data from the Hollow 

Tree Brook watershed as a measure of the baseline water 

quality in the Ashokan Reservoir watershed. Water sampling 

at the Beaver Kill Tributary station was discontinued on 

September 30, 2006.

Cannonsville Watershed

There are four water-quality stations located in the 

Cannonsville Reservoir watershed. Two of the stations are 

located in the headwaters: Town Brook southeast of Hobart 

(USGS station number 01421618, site 6) and Town Brook 

Tributary (USGS station number 01421614, site 7). The Town 

Brook station, which has been in operation since October 

1997, is located 1.4 mi upstream from the confluence of Town 

Brook and the West Branch Delaware River in Delaware 

County. The Town Brook watershed is 49 percent forested and 

51 percent agricultural consisting of pasture, row crops, and 

hay associated with small family-owned dairy farms. There are 

many residences in the watershed, but no towns or villages. 

The Town Brook Tributary station is located 0.3 mi upstream 

from the confluence with Town Brook and is 100 percent 

forested. There is evidence of past agricultural land use in the 

small watershed, but no farming has occurred for about 

80 years. The remains of a small water-supply reservoir 

that has been completely silted-in is less than 100 yards 

downstream from the station on Town Brook Tributary.

Further down the West Branch Delaware River valley, 

East Brook enters the West Branch Delaware River in the 

Village of Walton in Delaware County. There are two waterquality stations in the East Brook watershed: East Brook east 

of Walton (USGS station number 01422747, site 8) and Wolf 

Creek at Mundale (USGS station number 01422738, site 9). 

The East Brook station, which has been in operation since 

October 1998, is located 0.55 mi upstream from the mouth of 

the stream, and within the Village of Walton. The watershed is 

54 percent forested and 45 percent agricultural land use; most 

of the agricultural land is used for pasture and grassland. The 

Wolf Creek watershed is located in the headwaters of East 

Brook; it is 75 percent forested and 24 percent agricultural 

land use. Wolf Creek is the only upper node station with more 

than 3 percent agricultural land use (table 1). The station is 

located 8 mi northeast of Walton, about 0.3 mi from the mouth 

of Wolf Creek.

Pepacton Watershed

There were no water-quality stations in the Pepacton 

Reservoir watershed during the 2006 water year.

Neversink Watershed

There are 4 water-quality stations in the Neversink 

Reservoir watershed—one lower node station, Neversink 

River near Claryville (USGS station number 01435000, 

site 10), and 3 upper node stations, Biscuit Brook above 

Pigeon Brook (USGS station number 01434025, site 11), 

West Branch Neversink River at Winnisook Lake (USGS 

station number 01434021, site 12) (referred to hereafter as 

the Winnisook station), and East Branch Neversink River 

northeast of Denning (USGS station number 0143400680, 

site 13) (referred to hereafter as the Tisons station). The 

Neversink River station has been in operation since 1937 

and is located 2.2 mi downstream from the confluence of 

the East and West Branches and about 3.2 mi upstream from 

the Neversink reservoir. The Neversink River watershed 

is 98 percent forested and includes a few residences and a 

6,000 acre residential camping, environmental education, 

and conference center. All of the upper node watersheds are 
4 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

100 percent forested. The Biscuit Brook station has been in 

operation since 1983 and is located within the 6,000 acre 

residential camping complex, 0.6 mi upstream of the mouth of 

the brook (fig. 1). The Winnisook station, which has been in 

operation since 1991, is located on the West Branch Neversink 

River about 4.5 mi northeast of the Biscuit Brook station. 

This station measures drainage from the north face of Slide 

Mountain, the highest peak in the Catskill Mountains. The 

Tisons watershed drains the headwaters of the East Branch 

Neversink River, including the southern slopes of Slide 

Mountain. The station has been in operation since 1990 and is 

located 9.6 mi upstream from the confluence of the East and 

West Branches.

The Neversink watershed is the only watershed in the 

network that has multiple upper node stations associated with 

one lower node station. The Neversink watershed has been 

a focus of acid rain research since the early 1980s and is the 

most acidic of the West-of-Hudson reservoir streams. The 

three upper node stations in the Neversink watershed also are 

part of the Long-Term Monitoring (LTM) network operated 

by the USGS, in cooperation with the U.S. Environmental 

Protection Agency (USEPA). Data from the LTM network are 

used to measure changes in stream-water quality in response 

to reductions in acidic deposition as a result of the Title IV 

amendment of the Clean Air Act. The additional data collected 

for the LTM network are added to the data collected for 

the Catskill/Delaware Water Quality Network. As a result, 

baseline water-quality data in the Neversink watershed have 

been well characterized, and trends in water quality caused 

by trends in atmospheric deposition or changes in the climate 

are well documented. Wet-only atmospheric deposition is 

collected at a U.S. Geological Survey National Atmospheric 

Deposition Program (NADP) collector located 0.14 mi from 

the Biscuit Brook station. Samples are collected weekly 

and shipped to the NADP Central Analytical Laboratory 

in Champaign, Ill., for analyses of major ions. These data 

are available through the National Atmospheric Deposition 

Program website: http://nadp.sws.uiuc.edu/.

Table 1. Characteristics for water-quality stations in or associated with the U.S. Geological Survey Catskill/Delaware Water Quality 

Network in the Catskill Mountains, New York.

[Land-use percentages were calculated using the 1992 National Land Cover Dataset. Site ID corresponds to locations in figure 1. USGS, U.S. Geological 

Survey; mi2, square miles; ft, feet]

Site 

ID Station name

USGS gaging station 

number

Latitude Longitude Area 

(mi2

)

Elevation 

(ft)

Land use 

(in percent)

Forest Agriculture

Residential

1 Batavia Kill at Red Falls 01349950 42°18′30′′ 74°23′25′′ 68.6 1,260 80 19 1

2 Batavia Kill near Maplecrest 01349840 42°17′22′′ 74°06′59′′ 2.03 2,160 100 0 0

3 Stony Clove near Phoenicia 01362380 42°05′53′′ 74°19′03′′ 31.5 900 98 1 1

4 Hollow Tree Brook at Lanesville 01362342 42°08′32′′ 74°15′55′′ 1.95 1,480 99 1 0

5 Beaver Kill Tributary above 

Lake Hill

01362465 42°04′59′′ 74°10′59′′ 0.98 1,300 99 0 1

6 Town Brook southeast of Hobart 01421618 42°21′40′′ 74°39′45′′ 14.3 1,670 49 51 0

7 Town Brook Tributary 01421614 42°20′58′′ 74°36′41′′ 0.76 1,900 97 3 0

8 East Brook east of Walton 01422747 42°10′22′′ 75°07′18′′ 24.7 1,240 54 45 1

9 Wolf Creek at Mundale 01422738 42°15′34′′ 75°02′32′′ 0.61 1,760 75 24 1

10 Neversink River at Claryville 01435000 41°53′24′′ 74°35′25′′ 66.6 1,522 98 1 1

11 Biscuit Brook above Pigeon 

Brook at Frost Valley

01434025 41°59′43′′ 74°30′05′′ 3.72 2,060 100 0 0

12 West Branch Neversink River at 

Winnisook Lake

01434021 42°00′40′′ 74°24′53′′ 0.77 2,680 100 0 0

13 East Branch Neversink River 

northeast of Denning

0143400680 41°58′01′′ 74°26′54′′ 8.93 2,140 100 0 0

14 Rondout Creek above Red Brook 

at Peekamoose

01364959 41°56′13′′ 74°22′30′′ 5.36 1,740 100 0 0
Methods 5

Rondout Watershed

No sites in the Catskill/Delaware network are located 

in the Rondout Reservoir watershed; however, one station in 

the watershed is part of the LTM network. Rondout Creek 

above Red Brook at Peekamoose (USGS station number 

01364959, site 14) is located 0.8 mi upstream from the outlet 

of Peekamoose Lake and has been in operation since 1996. 

The watershed is 100 percent forested and is located on New 

York State Forest Preserve land. The Rondout Creek station 

is included in this report because it is typically included in 

interpretations of network data. The sampling strategy at this 

site is similar to the strategy at sites in the Catskill/Delaware 

Water-Quality Network and the water-quality analyses are 

almost identical.

Climate Summary

During the 2006 calendar year the average annual 

temperature for the contiguous United States was 54.9°F, the 

second warmest on record (1895 to 2006) (National Climatic 

Data Center (NCDC), 2007). The annual temperature in New 

York State was classified as “much above normal” during 

2006 (NCDC, 2007). At the Slide Mountain meteorological 

station within the Neversink watershed the 30-year mean 

annual temperature was 41.3°F from 1971 to 2000, and the 

mean for 2006 was 44.4°F. In 2006, the northeastern United 

States had the wettest summer recorded, and the annual 

precipitation was considered “much above normal” (NCDC, 

2007). Precipitation totaled 69.1 in. at Slide Mountain (fig. 1) 

during 2006 and 108.5 in. of snow fell during the winter of 

2005–06. 

Methods

This section presents a description of the field, laboratory, 

and statistical methods used for this study. Water-quality 

samples were collected at each site every other week and 

during storms, for an average 8 storms per site and 62 samples 

per site.

Field Methods

All water-quality sampling and field data collection 

were conducted by USGS personnel using standard USGS 

data collection protocols (USGS, variously dated). Field data 

collection was separated into two categories, streamflow data 

collection and water-quality data collection. Stream stage 

was recorded at 15-minute intervals using a datalogger and 

discharge measurements were made at 8 week intervals and 

during high flow. Stage-discharge relations were developed 

for each site to compute the discharge. A sampling hydrograph 

was drafted for each site showing the stream-flow hydrograph 

and the date and time each sample was collected.

Water-quality samples were collected every 2 weeks at 

each site. The sites were divided into two groups—a western 

field trip and an eastern field trip; the two field trips were 

completed on the same day whenever possible. Grab samples 

were collected in 1 liter acid-washed polypropelene bottles 

from the center of the channel whenever possible or from the 

streambank. The bottles were rinsed 3 times with streamwater, 

filled, and stored on ice until delivered to the laboratory in 

Troy, N.Y., where samples were refrigerated at 4°C until 

analyzed. Each site was equipped with a stage-activated 

automated sampler which collected water-quality samples 

during storms and winter thaws. Whenever possible automated 

samples were retrieved and processed within 24 hours of 

collection, though there were times when some samples were 

processed as long as 48 hours after collection. Field quality 

assurance and quality control were assessed through collection 

of triplicate samples and blanks.

Laboratory Methods

Streamwater samples were chilled at 4°C until analysis 

by ion chromatography for Cl-

, SO4

2-, and NO3-

. Inductively 

coupled plasma-optical emission spectrometry was used for 

Ca2+, Mg2+, SiO2

, and total dissolved Al (Altd), and atomic 

absorption spectrophotometry for Na+

 and K+ (Lawrence and 

others, 1995). Dissolved organic carbon (DOC) was analyzed 

with a Dohrmann carbon analyzer. A pH electrode was used 

to determine pH, and an auto-titrator was used to determine 

ANC (acid neutralizing capacity) (Lawrence and others, 

1995). Speciated Al was determined by complexation with 

pyrocatechol violet, according to a two-channel flow injection 

method (Henshaw and others, 1988). The first channel yields 

total monomeric Al (Almono) on an untreated aliquot, and the 

second channel yields organic monomeric Al (Alorg) after the 

sample passes through a cation exchange resin. All phosphorus 

fractions were analyzed at the USGS National Water Quality 

Laboratory in Denver, Colo. Total phosphorus aliquots were 

acidified with 1 milliliter of 4.5 N sulfuric acid and analyzed 

using semi-automated colorimetry. Total dissolved phosphorus 

and orthophosphate (soluble reactive phosphorus) were filtered 

through 0.4-micron polycarbonate filters and analyzed using 

colorimetry (Fishman, 1993). DOC samples were filtered 

through nominal 0.7-micron glass fiber filters prior to analysis. 

Sample aliquots for major cations (Ca2+, Mg2+, Na+

, and K+), 

major anions (Cl-

, SO4

2-, and NO3-

), and aluminum species 

(Altd, Almono, and Alorg) were filtered through 0.4-micron 

polycarbonate filters prior to analysis.

Laboratory activities were subjected to the quality 

assurance and control procedures of the USGS Watershed 

Research Program which has been reviewed by the USEPA 

Office of Research and Development. The laboratory qualityassurance program includes quality-control samples, sample 

blanks, blind-audit samples, and sample triplicates. A detailed 
6 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

description of the laboratory quality-assurance program can be 

found in the laboratory quality-assurance reports (Lincoln and 

others, 2006a and b).

Statistical Methods

Summary statistics were calculated for each water-quality 

parameter. For solutes that included censored values (values 

below the limit of quantification—TP, TDP, SRP, and SSC) 

means and medians were estimated. For less than 50 percent 

censored values the Kaplan-Meier statistic was used, but only 

the median was calculated because the lowest values were 

censored which causes the mean calculated by the KaplanMeier statistic to be biased high (Helsel, 2005). For 50 to 

80 percent censored data maximum likelihood estimation was 

used (Helsel, 2005). For sites with greater than 80 percent 

censored values, no summary statistics were calculated 

indicated as NC in the summary statistics tables.
Water-Quality Station Summary
8 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01349840 BATAVIA KILL NEAR MAPLECREST, NY 

LOCATION. lat. 42°

17′22′′, long. 74°06′59′′, Greene County, Hydrologic Unit 02020005, on left bank 

off County Route 56, 4.1 mi northeast of Maplecrest. 

DRAINAGE AREA. 2.03 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 2,160 ft above sea level, from 

topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

REMARKS. There were 60 samples collected during the 2006 water year. Seven storms were sampled 

with 1–7 samples collected per storm. Acid neutralizing capacity reached a period of record high 

concentration at a discharge of 0.46 ft3

/s prior to a storm in early October 2005. Turbidity reached a 

period of record high concentration at a discharge of 18.4 ft3

/s during a storm in early October 2005. 

Soluble reactive phosphorus reached a period of record high on August 8, 2006, at a flow of 0.47 ft3/s. 
Water-Quality Station Summary

9

01349840 BATAVIA KILL NEAR MAPLECREST, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp °C 

Spec Cond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 55 60 60 60 60 60 60 60 55 60 60 56 59 60 60 60 60 60 60 43 Mean 8.1 20.88 6.36 63.63 2.42 0.46 0.20 0.67 0.32 1.21 0.02 0.00 0.53 3.63 2.78 1.50 0.06 0.01 0.00 4.71 Std Dev 4.3 3.27 0.27 31.59 0.43 0.08 0.09 0.17 0.18 0.65 0.02 0.00 0.12 0.43 1.51 0.31 0.03 0.01 0.01 9.79Median 8.7 20.50 6.40 57.11 2.35 0.45 0.18 0.66 0.31 1.12 0.01 0.00 0.52 3.75 2.59 1.47 0.05 0.01 0.00 1.23 Min -0.1 14.20 5.67 30.18 1.61 0.33 0.12 0.37 0.02 0.06 0.00 0.00 0.30 2.33 0.98 1.01 0.01 0.00 0.00 0.26 Max 16.1 33.40 6.85 200.10 4.00 0.77 0.50 1.25 0.80 3.01 0.18 0.00 0.98 4.54 6.78 2.40 0.14 0.06 0.03 58.80 

SUMMARY STATISTICS, OCTOBER 1997 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 475 474 482 482 483 483 482 472 350 483 421 350 482 483 481 483 482 481 481 138 Mean 7.7 23.16 6.49 75.89 2.61 0.51 0.20 0.72 0.38 1.21 0.02 0.00 0.46 3.99 2.74 1.55 0.05 0.01 0.00 4.42Std Dev 4.8 3.86 0.30 34.88 0.47 0.10 0.10 0.20 0.17 0.66 0.02 0.00 0.17 0.68 1.60 0.38 0.04 0.01 0.01 8.30 Median 7.9 22.85 6.53 69.90 2.53 0.50 0.17 0.71 0.36 1.12 0.02 0.00 0.45 4.02 2.36 1.54 0.03 0.01 0.00 1.23 Min -0.3 11.52 5.54 10.70 1.61 0.29 0.07 0.23 0.00 0.00 0.00 0.00 0.01 0.16 0.96 0.11 0.01 0.00 0.00 0.17 Max 16.2 37.40 7.24 200.10 4.79 0.79 0.88 1.29 0.97 4.59 0.20 0.02 2.27 6.07 10.11 2.48 0.24 0.13 0.10 58.80

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 42 42 42 60Censored 1 2 25 16Mean NC NC NC NCStd Dev NC NC NC NCMedian 0.009 0.005 NC 1Min < 0.002 < 0.002 < 0.003 < 0.5Max 0.065 0.014 0.013 85

 SUMMARY STATISTICS,  OCTOBER 1997 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 314 319 314 261Censored 14 16 160 35Mean NC NC 0.004 NCStd Dev NC NC 0.004 NCMedian 0.007 0.005 0.002 2Min < 0.002 < 0.002 < 0.001 0.2Max 0.29 0.023 0.013 1000
10 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01349950 BATAVIA KILL AT RED FALLS NEAR PRATTSVILLE, NY 

LOCATION. lat. 42°

18′30′′, long. 74°23′25′′, Greene County, Hydrologic Unit 02020005, on 

right bank 200 ft southwest of State Highway 23 at Red Falls, 1.9 mi upstream from mouth, and 

2.2 mi southeast of Prattsville.

DRAINAGE AREA. 68.6 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,260 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1999 to September 2006. 

REMARKS. There were 60 samples collected during the 2006 water year. Nine storms were 

sampled with 1–7 samples collected per storm. SO4 reached a period of record high 

concentration at a discharge of 203 ft3

/s during a storm in early October 2005. On the rising limb 

of a secondary peak of the same storm SRP and TDP also reached period of record high 

concentrations at a discharge of 330 ft3

/s. 
Water-Quality Station Summary

11

01349950 BATAVIA KILL AT RED FALLS NEAR PRATTSVILLE, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 59 60 60 60 60 60 60 60 59 60 60 59 59 60 60 60 60 60 60 40 Mean 10.9 85.76 6.97 270.61 6.43 1.33 0.61 7.43 0.36 0.99 0.03 0.00 12.71 6.35 2.73 1.69 0.03 0.02 0.01 30.11 Std Dev 6.3 26.23 0.19 100.33 1.79 0.42 0.22 2.28 0.14 0.48 0.02 0.00 5.27 1.76 1.02 0.23 0.02 0.01 0.01 38.01 Median 12.1 80.20 6.98 237.45 5.99 1.19 0.53 7.16 0.32 1.04 0.03 0.00 12.73 6.08 2.61 1.71 0.02 0.01 0.00 11.05Min -0.2 45.90 6.50 147.14 3.96 0.78 0.37 3.24 0.10 0.00 0.00 0.00 3.95 3.47 1.09 0.86 0.01 0.00 0.00 1.49 Max 24.8 164.10 7.47 529.64 11.92 2.67 1.48 13.78 0.96 1.96 0.08 0.01 32.53 12.01 4.56 2.18 0.14 0.07 0.05 149 

SUMMARY STATISTICS, OCTOBER 1999 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 362 364 364 364 365 365 365 361 305 365 356 304 362 365 359 365 334 334 334 140Mean 9.6 91.41 7.04 277.43 6.66 1.46 0.64 7.99 0.34 0.74 0.03 0.00 13.83 5.89 2.64 1.60 0.03 0.01 0.00 42.37 Std Dev 7.2 31.69 0.24 111.57 2.22 0.49 0.21 3.11 0.16 0.54 0.02 0.00 7.56 1.39 1.10 0.32 0.04 0.01 0.01 78.11 Median 9.2 85.05 7.02 247.37 6.18 1.37 0.57 7.49 0.32 0.72 0.03 0.00 12.32 5.80 2.43 1.63 0.02 0.01 0.00 9.78 Min -0.7 44.00 6.47 101.55 3.69 0.71 0.30 2.70 0.00 0.00 0.00 0.00 0.00 1.10 0.92 0.43 0.00 0.00 0.00 1.12Max 25.6 322.00 7.80 896.17 22.42 4.14 1.58 28.46 1.16 2.00 0.18 0.02 65.94 12.01 6.47 2.30 0.40 0.15 0.12 570 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 40 40 40 59Censored 0 3 24 0 Mean 0.033 NC NC 108 Std Dev 0.035 NC NC 217 Median 0.014 0.005 NC 34 Min 0.003 < 0.002 < 0.003 1 Max 0.133 0.063 0.047 1000 

 SUMMARY STATISTICS,  OCTOBER 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 312 312 312 254Censored 1 42 222 1 Mean NC NC 0.002 88 Std Dev NC NC 0.003 170 Median 0.015 0.005 0.001 17 Min < 0.002 < 0.002 < 0.001 0.25 Max 0.456 0.063 0.047 1090 
12 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01362342 HOLLOW TREE BROOK AT LANESVILLE, NY 

LOCATION. lat. 42°

08′32′′, long. 74°15′55′′, Greene County, Hydrologic Unit 02020006, on 

left bank downstream from bridge on Diamond Notch Road, about 1.0 mi upstream from mouth, 

and 1.0 mi north of Lanesville. 

DRAINAGE AREA. 1.95 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,480 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

REMARKS. There were 60 samples collected during the 2006 water year. Seven storms were 

sampled with 2–9 samples collected per storm. Specific conductance, Ca2+, TDN, and NO3

-

reached period of record high concentrations during a storm in early October 2005. Turbidity and 

TP reached period of record high concentrations during a large storm in late November 2005. 
Water-Quality Station Summary

13

01362342 HOLLOW TREE BROOK AT LANESVILLE, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 60 60 60 60 60 60 60 60 59 57 59 59 57 57 60 60 60 60 60 45 Mean 9.0 33.27 6.69 129.82 4.43 0.69 0.27 0.57 0.75 3.46 0.02 0.00 0.72 4.64 1.65 1.31 0.03 0.00 0.00 7.91 Std Dev 3.6 5.60 0.18 42.00 0.83 0.10 0.05 0.13 0.31 1.25 0.02 0.00 0.24 0.54 0.81 0.24 0.05 0.00 0.00 14.54 Median 10.0 33.05 6.66 124.70 4.40 0.68 0.27 0.56 0.71 3.13 0.01 0.00 0.69 4.69 1.60 1.30 0.01 0.00 0.00 0.77Min 1.9 20.10 6.13 62.03 2.37 0.49 0.21 0.38 0.01 0.87 0 0.00 0.33 3.44 0.51 0.85 0.00 0.00 0.00 0.11 Max 15.1 48.40 7.05 247.49 6.51 0.95 0.45 0.90 2.06 9.03 0.11 0.01 1.73 5.72 3.82 1.94 0.33 0.01 0.01 77.50 

SUMMARY STATISTICS, OCTOBER 1997 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 425 423 430 430 428 428 427 417 322 425 394 317 425 424 429 429 427 429 429 127Mean 8.1 34.94 6.83 142.08 4.55 0.73 0.25 0.64 0.62 2.49 0.02 0.00 0.73 5.19 1.44 1.38 0.02 0.01 0.00 4.59 Std Dev 4.1 5.17 0.22 45.02 0.80 0.10 0.05 0.20 0.23 0.92 0.02 0.00 0.37 0.60 0.79 0.26 0.04 0.01 0.00 10.32 Median 7.9 34.40 6.84 138.88 4.46 0.71 0.23 0.63 0.62 2.44 0.01 0.00 0.69 5.23 1.22 1.33 0.01 0.00 0.00 0.50 Min -0.8 19.70 6.13 49.81 1.64 0.40 0.16 0.25 0.00 0.00 0.00 0.00 0.10 2.89 0.46 0.49 0.00 0.00 0.00 0.04Max 17.0 48.40 7.74 406.38 6.51 0.97 0.56 2.90 2.06 9.03 0.22 0.02 6.60 6.74 6.37 2.03 0.36 0.08 0.03 77.50 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 45 45 45 55 

Censored 0 0 8 20 Mean 0.037 0.007 NC NC Std Dev 0.071 0.003 NC NC Median 0.011 0.007 0.005 18 Min 0.002 0.002 <0.003 < 0.5 Max 0.34 0.013 0.014 788 

 SUMMARY STATISTICS,  OCTOBER 1997 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 281 288 283 250 

Censored 15 10 91 60 Mean NC NC NC NC Std Dev NC NC NC NC Median 0.008 0.006 0.004 2 Min 0.002 < 0.001 < 0.001 0.1 Max 0.34 0.025 0.014 1480 
14 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01362380 STONY CLOVE CREEK NEAR PHOENICIA, NY 

LOCATION. lat. 42°

05′53′′, long. 74°19′03′′, Ulster County, Hydrologic Unit 02020006, on left 

bank 0.5 mi south of Chichester on State Highway 214, and 1.3 mi upstream from mouth.

DRAINAGE AREA. 31.5 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. December 1996 to January 1997 (annual maximum only), February 

1997 to September 2006. 

REVISED RECORDS. WDR NY-99-1: 1997 (P), 1998 (P). 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 900 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1999 to September 2006. 

REMARKS. There were 62 samples collected during the 2006 water year. Eight storms were 

sampled with 3–8 samples collected per storm. Total dissolved nitrogen, NO3

-

, Almono, and 

Alorg reached period of record high concentrations during a storm in early October 2005. 

Ammonium and turbidity reached period of record high concentrations at a discharge of 

5,564 ft3/s during a storm in late June 2006. 
Water-Quality Station Summary

15

01362380 STONY CLOVE CREEK NEAR PHOENICIA, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 62 62 62 62 62 62 62 62 61 61 62 61 60 61 62 62 62 62 62 49 Mean 10.3 48.01 6.84 186.62 5.05 0.72 0.36 2.71 0.67 2.83 0.10 0.00 4.18 4.23 2.53 1.20 0.04 0.07 0.05 398.52 Std Dev 5.8 10.35 0.19 72.15 1.06 0.12 0.12 1.07 0.27 1.20 0.12 0.00 2.06 0.63 1.56 0.18 0.08 0.08 0.08 707.58 Median 9.9 46.40 6.81 175.48 4.95 0.70 0.34 2.63 0.64 2.79 0.04 0.00 3.79 4.36 2.30 1.17 0.02 0.04 0.03 78.10Min 0.6 24.50 6.42 92.18 3.19 0.53 0.19 0.83 0.11 0.12 0.00 0.00 0.52 2.93 0.66 0.87 0.01 0.00 0.00 0.43 Max 23.1 78.50 7.44 431.68 8.64 1.14 0.71 5.62 1.47 6.10 0.57 0.01 10.07 5.38 7.76 1.88 0.52 0.38 0.38 3462 

SUMMARY STATISTICS, OCTOBER 1999 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 356 353 353 353 353 353 353 350 295 352 350 292 348 352 347 353 325 326 326 145Mean 9.9 53.65 6.94 215.18 5.46 0.80 0.32 3.27 0.43 1.51 0.04 0.00 4.98 4.78 2.07 1.29 0.04 0.03 0.02 171.41 Std Dev 6.6 13.45 0.26 89.44 1.40 0.17 0.11 1.32 0.24 1.07 0.06 0.00 3.00 0.69 1.22 0.29 0.08 0.05 0.04 446.93 Median 9.7 50.90 6.93 194.25 5.12 0.76 0.29 3.01 0.40 1.37 0.02 0.00 4.54 4.80 1.72 1.28 0.02 0.01 0.00 23.40 Min -0.8 24.50 6.24 75.82 3.10 0.51 0.05 0.64 0.00 0.00 0.00 0.00 0.28 2.90 0.60 0.55 0.00 0.00 0.00 0.43Max 25.7 117.10 8.00 478.53 9.94 1.69 1.01 9.45 1.47 6.10 0.57 0.02 24.14 6.74 8.96 5.22 0.55 0.38 0.38 3462 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 48 48 48 58 

Censored 0 7 22 0 Mean 0.133 NC NC 877 Std Dev 0.168 NC NC 1264 Median 0.040 0.005 0.003 297 Min 0.005 < 0.002 < 0.003 3 Max 0.65 0.013 0.007 6340 

 SUMMARY STATISTICS,  OCTOBER 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 281 281 281 238 

Censored 0 65 199 0 Mean NC NC 0.002 273 Std Dev NC NC 0.002 717 Median 0.014 0.004 0.002 34 Min <0.002 < 0.002 < 0.001 1 Max 0.826 0.015 0.016 6340 
16 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01421614 TOWN BROOK TRIBUTARY SOUTHEAST OF HOBART, NY 

LOCATION. lat. 42°

20′58′′, long. 74°36′41′′, Delaware County, Hydrologic Unit 02040101, on 

left bank 0.3 mi upstream from mouth, and 3.3 mi southeast of Hobart.

DRAINAGE AREA. 0.76 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1998 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Supplementary water-stage recorder about 

15 ft upstream used for low-flow periods. Elevation of gage is 1,900 ft above sea level, from 

topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. September 1998 to September 2006. 

REMARKS. There were 60 samples collected during the 2006 water year. Seven storms were 

sampled with 2–6 samples collected per storm. Monomeric aluminum, Alorg, and turbidity 

reached period of record high concentrations at a discharge of 2.48 ft3

/s during a small storm in 

late May 2006. During the 2006 water year a timber stand improvement was carried out on Town 

of Hobart land within the Town Brook Tributary watershed for commercial sale and to thin the 

trees to promote forest growth. 
Water-Quality Station Summary

17

01421614 TOWN BROOK TRIBUTARY SOUTHEAST OF HOBART, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 59 60 60 60 60 60 60 60 59 60 60 59 60 60 60 60 60 60 60 43 Mean 9.2 32.29 6.71 147.85 3.93 0.60 0.31 1.16 0.37 1.36 0.03 0.00 0.64 5.06 2.14 1.99 0.04 0.02 0.01 113.98 Std Dev 4.9 9.20 0.21 71.22 1.03 0.16 0.14 0.62 0.13 0.60 0.02 0.00 0.36 0.90 1.01 0.36 0.07 0.05 0.05 455.56 Median 10.4 29.55 6.76 126.50 3.48 0.54 0.26 0.93 0.37 1.29 0.02 0.00 0.50 5.16 1.89 1.91 0.02 0.00 0.00 6.22Min -0.2 19.75 6.27 55.34 1.98 0.36 0.17 0.47 0.08 0.00 0.00 0.00 0.19 2.38 0.81 1.36 0.01 0.00 0.00 0.52 Max 17.5 57.40 7.11 352.43 6.34 0.99 0.76 3.17 0.76 3.21 0.11 0.02 1.74 6.83 4.56 2.87 0.51 0.38 0.37 2949 

SUMMARY STATISTICS, SEPTEMBER 1998 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 472 467 476 476 475 475 476 476 365 476 433 362 476 476 474 475 475 475 476 139Mean 9.0 34.28 6.81 150.05 4.12 0.64 0.29 1.17 0.49 1.70 0.02 0.00 0.57 5.22 2.11 1.97 0.03 0.01 0.00 64.80 Std Dev 5.4 8.04 0.25 65.10 0.89 0.14 0.12 0.59 0.23 0.78 0.03 0.00 0.31 0.93 1.07 0.39 0.06 0.02 0.02 265.11 Median 9.9 32.40 6.84 135.04 3.95 0.61 0.25 0.98 0.45 1.60 0.02 0.00 0.49 5.29 1.79 1.93 0.02 0.00 0.00 3.89 Min -0.3 17.34 5.96 11.19 1.98 0.36 0.15 0.40 0.00 0.00 0.00 0.00 0.16 2.03 0.80 1.00 0.00 0.00 0.00 0.28Max 19.2 58.20 7.39 378.43 6.70 1.17 0.88 3.56 1.81 4.38 0.38 0.02 2.17 7.67 6.43 3.05 0.78 0.38 0.37 2949 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 43 43 43 59Censored 1 1 2 6 Mean NC NC NC NC Std Dev NC NC NC NC Median 0.021 0.009 0.006 14 Min < 0.002 < 0.002 < 0.003 < 0.5 Max 1.67 0.020 0.019 2140 

 SUMMARY STATISTICS,  SEPTEMBER 1998 TO SEPTEMBER 2006 

 FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 342 345 344 261 

Censored 7 11 45 7 Mean NC NC NC NC Std Dev NC NC NC NCMedian 0.015 0.009 0.006 7Min < 0.002 < 0.002 < 0.001 0.1 Max 2.06 0.053 0.023 3060 
18 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01421618 TOWN BROOK SOUTHEAST OF HOBART, NY 

LOCATION. lat. 42°

21′40′′, long. 74°39′45′′, Delaware County, Hydrologic Unit 02040101, on 

left bank 10 ft downstream from bridge on Clove Road, 0.9 mi southeast of Hobart, and 1.4 mi 

upstream from mouth.

DRAINAGE AREA. 14.3 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,670 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. January 1999 to September 2006. 

REMARKS. There were 61 samples collected during the 2006 water year. Nine storms were 

sampled with 1–7 samples collected per storm. SO4 reached a period of record high 

concentration a discharge of 9.71 ft3

/s during low flow in early October 2005. Monomeric 

aluminum, Alorg, and SSC reached period of record high concentrations during a storm in late 

June at a discharge of 2,096 ft3

/s. 
Water-Quality Station Summary

19

01421618 TOWN BROOK SOUTHEAST OF HOBART, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 60 61 61 61 61 61 61 61 60 61 61 60 61 61 61 61 61 61 61 45 Mean 10.2 76.69 7.08 372.4 8.32 1.36 1.32 3.63 0.53 1.62 0.03 0.00 6.02 7.20 3.12 1.76 0.03 0.02 0.00 25.24 Std Dev 6.1 21.10 0.18 149.7 2.38 0.43 0.53 0.95 0.23 0.84 0.02 0.00 2.74 3.69 1.14 0.31 0.03 0.03 0.02 48.22 Median 11.0 69.30 7.07 330.6 7.43 1.20 1.15 3.34 0.52 1.53 0.02 0.00 5.35 6.20 2.91 1.77 0.02 0.01 0.00 3.79Min -0.3 50.00 6.76 182.6 5.23 0.84 0.54 1.69 0.00 0.31 0.00 0.00 0.57 0.53 1.28 1.11 0.01 0.00 0.00 0.53 Max 21.8 138.10 7.51 806.8 15.22 2.65 2.91 5.86 0.97 3.53 0.12 0.00 17.68 27.02 5.89 2.36 0.15 0.23 0.19 240 

SUMMARY STATISTICS, JANUARY 1999 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 441 451 451 451 452 452 430 445 337 452 448 335 450 453 423 453 377 377 377 153Mean 9.6 77.14 7.14 386.89 8.28 1.45 1.50 3.40 0.70 1.81 0.05 0.00 5.28 6.42 3.34 1.57 0.03 0.01 0.00 47.60 Std Dev 6.7 21.36 0.26 177.23 2.72 0.45 0.60 1.12 0.32 1.22 0.05 0.01 2.45 2.13 1.49 0.38 0.04 0.02 0.01 123.05 Median 9.6 72.00 7.12 339.73 7.62 1.35 1.35 3.18 0.67 1.53 0.03 0.00 4.66 6.00 2.99 1.57 0.02 0.01 0.00 5.10 Min -0.8 34.00 5.69 115.64 3.60 0.61 0.20 0.80 0.00 0.00 0.00 0.00 0.20 0.53 1.28 0.02 0.00 0.00 0.00 0.53Max 24.8 154.30 8.10 1258.99 20.06 3.03 4.10 9.30 2.24 5.69 0.41 0.04 20.36 27.02 9.02 2.43 0.52 0.23 0.19 833 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 45 45 45 61Censored 0 0 3 4 Mean 0.062 0.020 NC NC Std Dev 0.090 0.010 NC NC Median 0.030 0.018 0.012 7 Min 0.004 0.006 < 0.003 < 0.5 Max 0.51 0.048 0.035 22,900 

 SUMMARY STATISTICS,  JANUARY 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 441 441 441 303Censored 17 25 20 9 Mean NC NC NC NC Std Dev NC NC NC NC Median 0.044 0.025 0.018 10 Min < 0.002 < 0.003 < 0.003 0.25 Max 3.48 0.21 0.203 22,900 
20 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01422738 WOLF CREEK AT MUNDALE, NY 

LOCATION. lat. 42°

15′34′′, long. 75°02′32′′, Delaware County, Hydrologic Unit 02040101, on 

left bank 6 ft downstream from culvert on Munn Road, and 8 mi northeast of Walton. 

DRAINAGE AREA. 0.61 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1998 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,760 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1999 to September 2006. 

REMARKS. There were 60 samples collected during the 2006 water year. Five storms were 

sampled with 1–11 samples collected per storm. Specific conductance, ANC, Cl-

, SO4

2-, and 

SiO2 reached period of record high concentrations during a small storm in early October 2005. 

Monomeric aluminum, Alorg, TDP, and SRP reached period of record high concentrations 

during a large storm that occurred from June 26–28, 2006. This storm produced a period of 

record peak discharge of 350 ft3/s on June 28, 2006. Sodium reached a period of record high 

concentration on June 7, 2006, and K+

 reached a period of record high concentration on 

August 19, 2006. 
Water-Quality Station Summary

21

01422738 WOLF CREEK AT MUNDALE, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 59 59 59 59 60 60 60 60 56 55 59 56 54 55 59 60 60 60 60 NA Mean 10.8 38.52 6.69 134.21 3.76 1.07 0.90 1.17 0.29 0.72 0.03 0.00 2.84 6.03 2.47 1.83 0.04 0.02 0.02 NA Std Dev 5.9 15.53 0.23 80.97 1.51 0.44 0.62 0.54 0.12 0.45 0.05 0.00 2.70 2.29 1.00 0.45 0.04 0.05 0.04 NA Median 12.4 34.60 6.65 111.77 3.43 1.00 0.70 1.10 0.27 0.61 0.02 0.00 1.63 5.53 2.32 1.80 0.03 0.01 0.00 NAMin -0.3 17.40 6.23 39.67 1.62 0.43 0.16 0.47 0.00 0.00 0.00 0.00 0.58 2.85 1.03 1.03 0.01 0.00 0.00 NA Max 18.4 93.30 7.24 398.82 8.51 2.31 2.79 3.58 0.58 1.78 0.25 0.02 15.25 16.60 4.56 2.75 0.27 0.32 0.29 NA 

SUMMARY STATISTICS, OCTOBER 1999 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 368 365 366 366 368 368 368 367 307 363 354 304 362 363 366 368 365 367 367 NA Mean 8.7 39.52 6.74 142.31 3.86 1.15 0.72 1.20 0.32 0.86 0.02 0.00 2.46 5.63 2.25 1.76 0.03 0.01 0.00 NAStd Dev 5.5 12.30 0.28 79.36 1.30 0.38 0.42 0.39 0.16 0.58 0.03 0.00 1.91 1.47 0.86 0.40 0.03 0.02 0.02 NA Median 8.6 35.90 6.75 117.33 3.55 1.06 0.60 1.13 0.29 0.73 0.02 0.00 1.80 5.59 2.06 1.78 0.02 0.01 0.00 NA Min -0.4 17.40 5.84 26.29 1.62 0.43 0.16 0.47 0.00 0.00 0.00 0.00 0.11 0.28 0.82 0.25 0.00 0.00 0.00 NA Max 19.2 93.30 7.38 398.82 8.81 2.78 2.79 3.58 1.12 2.91 0.29 0.04 15.25 16.60 5.57 2.75 0.41 0.32 0.29 NA

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 35 35 35 NACensored 0 1 17 NA Mean 0.036 NC NC NA Std Dev 0.084 NC NC NA Median 0.010 0.006 0.003 NA Min 0.003 < 0.002 <0.003 NA Max 0.44 0.033 0.016 NA 

 SUMMARY STATISTICS,  OCTOBER 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 279 279 279 NACensored 6 9 178 NA Mean NC NC 0.003 NA Std Dev NC NC 0.003 NA Median 0.011 0.006 0.002 NA Min < 0.002 < 0.002 <0.001 NA Max 0.48 0.033 0.016 NA 
22 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01422747 EAST BROOK EAST OF WALTON, NY 

LOCATION. lat. 42°

10′22′′, long. 75°07′18′′, Delaware County, Hydrologic Unit 02040101, on 

right bank 150 ft downstream from bridge on East Street, in Walton, and 0.55 mi upstream from 

mouth (at West Branch Delaware River).

DRAINAGE AREA. 24.7 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1998 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,240 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1999 to September 2006. 

REMARKS. There were 57 samples collected during the 2006 water year. Five storms were 

sampled with 4–6 samples collected per storm. Sulfate reached a period of record high 

concentration at a discharge of 23 ft3

/s during low flow in mid-October 2005. Total phosphorus, 

Altd, Almono, and Alorg reached period of record high concentrations during a large storm that 

produced a period of record peak discharge of 7,110 ft3

/s on June 28, 2006. ANC reached a 

period of record high concentration at a discharge of 15 ft3

/s during low flow in early August 

2006. 
Water-Quality Station Summary

23

01422747 EAST BROOK EAST OF WALTON, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 56 57 57 57 57 57 57 57 53 57 57 53 55 57 57 57 57 57 57 NA Mean 9.3 57.36 6.91 209.07 4.65 1.33 0.88 3.48 0.34 1.05 0.03 0.00 5.74 6.39 2.19 1.75 0.04 0.02 0.01 NA Std Dev 5.5 15.10 0.19 85.18 1.20 0.37 0.31 1.32 0.15 0.48 0.03 0.00 2.72 1.44 1.02 0.30 0.08 0.05 0.04 NA Median 8.6 57.60 6.93 186.15 4.62 1.36 0.83 3.48 0.33 1.14 0.03 0.00 5.62 6.46 2.02 1.75 0.02 0.01 0.00 NAMin -0.3 29.80 6.44 84.94 2.33 0.48 0.18 0.72 0.00 0.00 0.00 0.00 0.36 3.62 0.85 1.07 0.00 0.00 0.00 NA Max 19.1 95.20 7.36 460.57 7.13 2.15 1.67 7.07 0.61 2.12 0.17 0.01 13.54 9.63 4.72 2.44 0.49 0.26 0.22 NA 

SUMMARY STATISTICS, OCTOBER 1999 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 374 374 373 373 375 375 374 370 293 372 367 292 370 374 366 375 341 341 341 NA Mean 8.8 60.46 6.95 225.79 5.00 1.50 0.90 3.50 0.41 1.19 0.03 0.00 5.58 6.38 2.06 1.71 0.03 0.01 0.00 NAStd Dev 5.8 13.34 0.24 78.97 1.12 0.34 0.27 1.28 0.18 0.71 0.03 0.00 2.34 1.15 0.96 0.31 0.04 0.02 0.02 NA Median 8.2 59.00 6.96 215.48 5.00 1.50 0.82 3.25 0.40 1.14 0.02 0.00 5.13 6.40 1.83 1.70 0.01 0.01 0.00 NA Min -0.5 29.80 6.26 73.49 1.88 0.48 0.18 0.26 0.00 0.00 0.00 0.00 0.20 2.30 0.79 0.74 0.00 0.00 0.00 NA Max 22.8 97.00 7.60 460.57 10.20 2.30 2.03 8.92 1.11 4.37 0.27 0.01 14.95 9.63 5.91 2.51 0.49 0.26 0.22 NA

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 44 44 44 NACensored 0 1 6 NA Mean 0.155 NC NC NA Std Dev 0.407 NC NC NA Median 0.017 0.010 0.007 NA Min 0.005 < 0.002 < 0.003 NA Max 2.12 0.045 0.034 NA 

 SUMMARY STATISTICS,  OCTOBER 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 323 323 323 NACensored 2 11 98 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.014 0.009 0.005 NA Min < 0.002 < 0.002 < 0.001 NA Max 2.12 0.052 0.037 NA 
24 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01434025 BISCUIT BROOK ABOVE PIGEON BROOK AT FROST VALLEY, NY 

LOCATION. lat. 41°

59′43′′, long. 74°30′05′′, Ulster County, Hydrologic Unit 02040104, on 

right bank 0.2 mi upstream from Pigeon Brook, 0.6 mi upstream from mouth, and 0.8 mi 

northeast of Frost Valley.

DRAINAGE AREA. 3.72 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. June 1983 to September 2006. February to May 1983 (occasional 

discharge measurements). 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 2,060 ft above sea level, 

from topographic map. Prior to September 11, 1987, at datum 1.00 ft higher. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. May 1991 to September 2006. Phosphorus concentrations began being 

analyzed in February 1998. 

REMARKS. There were 77 samples collected during the 2006 water year. Sixteen storms were 

sampled with 1–8 samples collected per storm. Total dissolved phosphorus and SRP reached 

period of record high concentrations during a January 2006 thaw at a discharge of 10.1 ft3

/s. 

Total dissolved aluminum and Almono reached period of record high concentrations at a 

discharge of 177 ft3/s during a storm in late June 2006. 
Water-Quality Station Summary

25

01434025 BISCUIT BROOK ABOVE PIGEON BROOK AT FROST VALLEY, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp °C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 77 77 77 77 77 77 77 77 77 75 77 77 75 75 77 77 77 77 77 NA Mean 8.2 18.00 5.66 17.74 1.85 0.40 0.25 0.28 0.37 1.23 0.02 0.00 0.53 3.74 3.00 0.79 0.12 0.04 0.02 NA Std Dev 4.9 1.67 0.39 12.71 0.32 0.06 0.12 0.06 0.15 0.64 0.02 0.00 0.17 0.48 1.47 0.16 0.08 0.04 0.02 NA Median 8.1 17.83 5.68 19.61 1.89 0.40 0.22 0.28 0.37 1.32 0.01 0.00 0.50 3.70 2.87 0.78 0.11 0.03 0.02 NAMin 0.3 14.15 4.66 -15.28 0.35 0.16 0.14 0.18 0.05 0.00 0.00 0.00 0.19 2.55 0.97 0.48 0.02 0.00 0.00 NA Max 16.2 22.50 6.32 54.09 2.45 0.55 0.79 0.46 0.73 3.13 0.06 0.01 1.11 4.55 7.06 1.23 0.50 0.27 0.13 NA 

SUMMARY STATISTICS, MAY 1991 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 1402 1296 1527 1522 1515 1530 1525 1535 557 1534 958 551 1534 1534 1534 1538 675 1535 1533 NA Mean 7.7 20.75 6.01 24.10 2.17 0.49 0.22 0.33 0.37 1.25 0.02 0.00 0.52 4.87 2.19 0.96 0.08 0.03 0.02 NAStd Dev 5.3 3.01 0.39 14.54 0.40 0.08 0.10 0.08 0.21 0.82 0.02 0.00 0.15 0.86 1.26 0.23 0.06 0.03 0.02 NA Median 7.9 20.30 6.11 24.82 2.14 0.49 0.19 0.31 0.34 1.09 0.01 0.00 0.50 4.84 1.81 0.95 0.06 0.02 0.01 NA Min -0.7 14.01 4.60 -29.60 0.11 0.16 0.09 0.09 0.00 0.00 0.00 0.00 0.11 1.36 0.38 0.04 0.01 0.00 0.00 NA Max 18.3 39.80 7.70 203.56 4.27 1.04 1.15 0.86 1.52 7.68 0.30 0.02 1.29 8.58 9.16 2.70 0.50 0.27 0.18 NA

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 52 52 52 NACensored 6 19 40 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.006 0.003 NC NA Min < 0.002 < 0.002 < 0.003 NA Max 0.176 0.040 0.033 NA 

 SUMMARY STATISTICS,  FEBRUARY 1998 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 364 366 368 NACensored 98 148 310 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.004 0.003 NC NA Min < 0.002 < 0.002 < 0.001 NA Max 0.438 0.040 0.033 NA 
26 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

0143400680 EAST BRANCH NEVERSINK RIVER NORTHEAST OF DENNING, NY 

LOCATION. lat. 41°

58′01′′, long. 74°26′54′′, Ulster County, Hydrologic Unit 02040104, on 

right bank 0.3 mi upstream from Tray Mill Brook, and 2.3 mi northeast of Denning.

DRAINAGE AREA. 8.93 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. October 1990 to September 2006. Occasional discharge 

measurements, water years 1988–90. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 2,140 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. May 1991 to September 2006. Phosphorus concentrations began being 

analyzed in February 1999. 

REMARKS. There were 62 samples collected during the 2006 water year. Ten storms were 

sampled with 1–6 samples collected per storm. All sample concentrations were within the range 

of concentrations measured previously. 
Water-Quality Station Summary

27

0143400680 EAST BRANCH NEVERSINK RIVER NORTHEAST OF DENNING, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 62 62 62 62 62 62 62 62 5 59 62 59 59 62 62 62 62 62 NA Mean 8.5 19.64 4.90 -8.34 0.92 0.39 0.24 0.28 0.47 1.28 0.02 0.50 3.69 3.87 0.83 0.25 0.13 0.05 NA Std Dev 4.8 2.34 0.28 10.72 0.24 0.08 0.08 0.05 0.13 0.58 0.01 0.20 0.61 2.17 0.19 0.11 0.06 0.04 NA Median 8.9 19.11 4.94 -4.65 0.92 0.40 0.22 0.28 0.47 1.34 0.02 0.47 3.86 3.69 0.87 0.24 0.13 0.05 NAMin 0.4 14.40 4.47 -30.52 0.57 0.24 0.17 0.17 0.32 0.33 0.00 0.22 2.21 1.09 0.45 0.10 0.03 0.00 NA Max 16.9 26.80 5.50 11.43 2.16 0.52 0.60 0.38 0.63 2.53 0.06 1.19 4.66 9.23 1.18 0.72 0.23 0.14 NA 

SUMMARY STATISTICS, MAY 1991 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 848 818 984 983 970 976 986 984 62 982 692 59 982 981 976 987 464 987 987 NA Mean 7.8 20.99 4.87 -11.98 1.02 0.48 0.24 0.30 0.29 1.18 0.02 0.00 0.47 4.53 3.40 0.95 0.26 0.14 0.05 NAStd Dev 5.1 3.12 0.23 11.10 0.21 0.09 0.09 0.06 0.15 0.74 0.03 0.00 0.15 0.77 2.22 0.24 0.12 0.08 0.04 NA Median 7.8 20.49 4.88 -10.47 1.01 0.48 0.22 0.30 0.26 1.02 0.01 0.00 0.46 4.49 2.98 0.96 0.23 0.13 0.04 NA Min -0.8 14.40 4.34 -128.27 0.53 0.22 0.05 0.13 0.00 0.00 0.00 0.00 0.18 2.07 0.00 0.18 0.07 0.00 0.00 NA Max 21.9 39.10 5.96 68.30 2.17 0.70 0.93 0.64 0.76 4.46 0.31 0.01 1.76 6.58 11.96 1.67 0.80 0.43 0.30 NA

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 50 50 50 NACensored 10 23 40 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.004 0.002 NC NA Min < 0.002 < 0.002 < 0.003 NA Max 0.092 0.012 0.007 NA 

 SUMMARY STATISTICS,  FEBRUARY 1999 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 335 336 335 NACensored 122 191 290 NA Mean NC 0.003 NC NA Std Dev NC 0.002 NC NA Median 0.003 0.002 NC NA Min < 0.002 < 0.002 < 0.001 NA Max 0.303 0.029 0.016 NA 
28 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01434021 WEST BRANCH NEVERSINK RIVER AT WINNISOOK LAKE NEAR 

FROST VALLEY, NY 

LOCATION. lat. 42°00′40′′, long. 74°24′53′′, Ulster County, Hydrologic Unit 02040104, on 

right bank 0.1 mi southwest of Winnisook Lake, and 4.5 mi northeast of Frost Valley.

DRAINAGE AREA. 0.77 mi2. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. January 1991 to September 2006. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 2,680 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. May 1991 to September 2006. Phosphorus concentrations began being 

analyzed in January 1999. 

REMARKS. There were 60 samples collected during the 2006 water year. Nine storms were 

sampled with 1–7 samples collected per storm. All sample concentrations were within the range 

of concentrations measured previously. 
Water-Quality Station Summary

29

01434021 WEST BRANCH NEVERSINK RIVER AT WINNISOOK LAKE NEAR FROST VALLEY, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 60 60 60 60 60 60 60 60 4 59 60 4 59 59 60 60 60 60 60 NA Mean 8.2 21.59 4.72 -17.40 0.71 0.30 0.20 0.25 0.61 1.26 0.02 0.00 0.49 3.86 3.82 0.78 0.39 0.23 0.07 NA Std Dev 4.2 3.00 0.29 15.97 0.29 0.09 0.10 0.10 0.14 0.56 0.01 0.00 0.20 0.67 2.32 0.19 0.12 0.09 0.05 NA Median 8.9 20.75 4.68 -15.74 0.67 0.30 0.16 0.24 0.64 1.19 0.02 0.00 0.42 3.99 3.20 0.82 0.42 0.23 0.06 NA Min 0.5 17.29 4.28 -48.78 0.34 0.14 0.12 0.15 0.42 0.32 0.00 0.00 0.20 2.25 1.11 0.41 0.06 0.01 0.00 NA Max 14.7 29.70 5.63 17.35 1.92 0.47 0.74 0.93 0.75 2.81 0.06 0.00 1.11 5.04 9.68 1.12 0.64 0.43 0.19 NA 

SUMMARY STATISTICS, MAY 1991 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 889 506 1029 1028 949 1027 1026 1027 63 1029 684 56 1030 1029 1025 1030 428 1032 1030 NAMean 6.5 22.44 4.69 -20.66 0.82 0.39 0.19 0.25 0.32 1.16 0.02 0.00 0.44 4.80 2.83 0.93 0.39 0.24 0.05 NA Std Dev 4.6 2.90 0.19 11.13 0.26 0.11 0.09 0.06 0.25 0.68 0.07 0.00 0.15 0.91 1.92 0.25 0.16 0.12 0.04 NA Median 6.2 21.58 4.70 -19.78 0.82 0.41 0.18 0.25 0.25 1.06 0.01 0.00 0.43 4.90 2.26 0.96 0.38 0.23 0.05 NA Min -1.3 9.38 4.28 -56.50 0.27 0.13 0.03 0.03 0.00 0.00 0.00 0.00 0.02 0.18 0.14 0.00 0.06 0.00 0.00 NAMax 15.2 33.60 6.53 96.96 3.22 1.46 0.74 0.99 1.50 4.48 1.30 0.01 2.22 6.53 11.65 2.29 0.98 0.69 0.31 NA 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 48 48 48 NA 

Censored 7 16 35 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.004 0.003 NC NA Min < 0.002 < 0.002 < 0.003 NA Max 0.068 0.013 0.007 NA 

 SUMMARY STATISTICS,  JANUARY 1999 TO SEPTEMBER 2006 

 FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n 323 324 322 NA 

Censored 95 138 271 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.003 0.002 NC NA Min < 0.002 < 0.002 < 0.001 NA Max 0.141 0.019 0.008 NA 
30 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

DELAWARE RIVER BASIN 

01435000 NEVERSINK RIVER NEAR CLARYVILLE, NY 

LOCATION. lat. 41°

53′24′′, long. 74°35′25′′, Sullivan County, Hydrologic Unit 02040104, on 

left bank 50 ft downstream from covered bridge, 300 ft upstream from small tributary, 2.2 mi 

downstream from confluence of East and West Branches, and 2.2 mi southwest of Claryville. 

DRAINAGE AREA. 66.6 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD (Revised). November 1937 to May 1949, July 1951 to September 

2006. Prior to July 1951, published as “at Halls Mills near Curry” (01435500). 

REVISED RECORDS (Revised). WDR NY-75-1: Gage datum. WDR NY-82-1: Drainage area. 

GAGE. Water-stage recorder. Elevation of gage is 1,522.37 ft above sea level from topographic 

map. Prior to October 1, 1974, at datum 6.00 ft higher. October 1, 1974 to September 30, 1979, 

at datum 5.00 ft higher. November 1937 to May 1949, at site 1.3 mi downstream at elevation 

1,470 ft, from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. July 1991 to September 2006. Phosphorus concentrations began being 

analyzed in June 1998. 

REMARKS. There were 70 samples collected during the 2006 water year. Nine storms were 

sampled with 2–7 samples collected per storm. Total dissolved aluminum reached a period of 

record high concentration at a discharge of 536 ft3

/s during a small storm in mid-November 

2005. 
Water-Quality Station Summary

31

01435000 NEVERSINK RIVER NEAR CLARYVILLE, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 70 70 70 70 70 70 70 70 69 69 69 69 69 69 70 70 70 69 70 NA Mean 8.4 26.63 6.13 38.37 2.22 0.51 0.33 1.44 0.29 1.05 0.02 0.00 2.64 4.32 2.39 0.92 0.09 0.02 0.01 NA Std Dev 5.2 4.16 0.32 17.13 0.36 0.08 0.10 0.41 0.11 0.41 0.01 0.00 0.92 0.44 1.55 0.12 0.07 0.03 0.02 NA Median 7.9 26.75 6.17 37.43 2.25 0.52 0.29 1.45 0.30 1.06 0.01 0.00 2.70 4.43 1.96 0.92 0.07 0.01 0.00 NAMin 0.1 16.62 5.39 11.22 1.42 0.31 0.24 0.65 0.00 0.39 0.00 0.00 1.04 3.13 0.76 0.61 0.01 0 0.00 NA Max 16.8 34.60 6.63 86.54 3.09 0.67 0.84 2.33 0.58 2.60 0.07 0.00 4.83 5.19 7.22 1.14 0.40 0.13 0.09 NA 

SUMMARY STATISTICS, JULY 1991 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 817 625 814 812 815 816 813 795 410 813 611 409 813 814 812 786 363 813 813 NA Mean 8.1 28.06 6.20 40.48 2.33 0.58 0.33 1.46 0.34 1.05 0.03 0.00 2.46 4.81 2.26 0.98 0.08 0.03 0.01 NAStd Dev 5.5 6.18 0.40 22.73 0.45 0.11 0.12 1.06 0.19 0.64 0.06 0.00 1.63 0.70 1.45 0.21 0.07 0.03 0.02 NA Median 7.7 27.30 6.29 39.60 2.32 0.58 0.30 1.29 0.31 0.93 0.02 0.00 2.06 4.80 1.90 0.98 0.05 0.02 0.00 NA Min -0.1 14.15 5.02 -22.93 0.93 0.07 0.20 0.13 0.00 0.00 0.00 0.00 0.21 2.19 0.00 0.40 0.01 0.00 0.00 NA Max 25.3 70.90 7.25 169.30 4.79 1.43 1.33 19.10 1.22 4.93 1.23 0.01 17.55 8.28 10.30 3.68 0.40 0.17 0.14 NA

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 62 53 62 NACensored 8 20 46 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.004 0.002 NC NA Min < 0.002 < 0.002 < 0.003 NA Max 0.165 0.008 0.005 NA 

 SUMMARY STATISTICS,  JUNE 1998 TO SEPTEMBER 2006 

 FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 395 386 373 NACensored 75 158 320 NA Mean NC NC NC NA Std Dev NC NC NC NA Median 0.004 0.003 NC NA Min < 0.005 < 0.001 < 0.001 NA Max 0.797 0.032 0.027 NA 
32 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01362465 BEAVER KILL TRIBUTARY ABOVE LAKE HILL, NY 

LOCATION. lat. 42°

04′59′′, long. 74°10′59′′, Ulster County, Hydrologic Unit 02020006, on left 

bank about 500 ft upstream from confluence with Beaver Kill, and 1.2 mi north of Lake Hill.

DRAINAGE AREA. 0.98 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. July 2000 to September 2006 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,300 ft above NGVD of 

1929, from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. October 1997 to September 2006. 

REMARKS. There were 58 samples collected during the 2006 water year. Nine storms were 

sampled with 1–6 samples collected per storm. Chloride reached a period of record high 

concentration at a discharge of 16.7 ft3

/s during a storm in late November. Nitrate reached a 

period of record high concentration at a discharge of 24.9 ft3

/s during a large storm in late June 

2006. Sample water temperature reached a period of record high at a discharge of 0.06 ft3/s in 

early August 2006. 
Water-Quality Station Summary

33

01362465 BEAVER KILL TRIBUTARY ABOVE LAKE HILL, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 58 58 58 58 58 58 58 58 52 58 58 52 58 58 58 58 58 58 58 46 Mean 9.6 22.39 6.40 76.52 2.39 0.57 0.31 0.73 0.15 0.38 0.02 0.00 0.72 4.10 2.69 1.54 0.04 0.01 0.00 18.6 Std Dev 6.0 5.23 0.32 53.52 0.71 0.14 0.19 0.16 0.07 0.39 0.01 0.00 0.39 0.69 1.60 0.35 0.03 0.01 0.01 32.4 Median 9.3 20.95 6.40 60.12 2.21 0.53 0.25 0.71 0.15 0.30 0.02 0.00 0.59 4.12 2.12 1.55 0.03 0.01 0.00 1.79Min 0.1 15.48 5.74 21.50 1.39 0.36 0.13 0.45 0.00 0.00 0.00 0.00 0.38 2.69 0.70 0.84 0.01 0.00 0.00 0.39 Max 22.9 40.40 7.06 253.00 4.40 0.98 1.24 1.18 0.32 2.33 0.08 0.00 2.01 5.91 6.82 2.26 0.11 0.04 0.02 125 

SUMMARY STATISTICS, OCTOBER 1997 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 343 348 348 348 347 347 347 347 314 343 347 312 343 343 348 347 346 348 348 139Mean 10.0 25.05 6.52 93.26 2.69 0.64 0.28 0.83 0.17 0.29 0.02 0.00 0.62 4.64 2.62 1.70 0.04 0.01 0.01 12.6 Std Dev 6.3 5.02 0.32 50.73 0.68 0.14 0.22 0.19 0.12 0.34 0.02 0.00 0.25 1.00 1.69 0.32 0.06 0.08 0.06 35.9 Median 10.0 24.30 6.55 78.36 2.58 0.62 0.20 0.81 0.15 0.19 0.02 0.00 0.58 4.59 2.07 1.72 0.03 0.01 0.00 1.52 Min -0.9 13.66 5.60 21.50 1.24 0.33 0.10 0.35 0.00 0.00 0.00 0.00 0.16 1.93 0.70 0.84 0.00 0.00 0.00 0.05Max 22.9 45.30 7.15 355.91 6.25 1.31 2.04 1.45 0.77 2.33 0.14 0.05 2.01 7.95 8.78 2.37 0.45 1.19 1.01 348 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 47 47 47 57Censored 2 6 30 11 Mean NC NC NC 105 Std Dev NC NC NC 371 Median 0.010 0.005 NC 7 Min < 0.002 < 0.002 < 0.003 < 0.5 Max 0.300 0.016 0.006 2770 

 SUMMARY STATISTICS,  OCTOBER 1997 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC

n 255 255 255 262Censored 11 39 226 23 Mean NC NC NC 86.1 Std Dev NC NC NC 1141 Median 0.006 0.004 NC 5 Min < 0.002 < 0.002 < 0.003 < 0.1 Max 0.720 0.074 0.063 2770 
34 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

HUDSON RIVER BASIN 

01364959 RONDOUT CREEK ABOVE RED BROOK AT PEEKAMOOSE, NY 

LOCATION. lat. 41°

56′13′′, long. 74°22′30′′, Ulster County, Hydrologic Unit 02020007, 500 ft 

upstream from mouth of Red Brook, 0.8 mi upstream from outlet of Peekamoose Lake, and 

0.8 mi north of Peekamoose.

DRAINAGE AREA. 5.36 mi2

. 

WATER-DISCHARGE RECORDS 

PERIOD OF RECORD. May 1996 to September 2006. Occasional discharge measurements, 

water years 1984–86, 1988–94. 

GAGE. Water-stage recorder and crest-stage gage. Elevation of gage is 1,740 ft above sea level, 

from topographic map. 

WATER-QUALITY RECORDS 

PERIOD OF RECORD. May 1991 to September 2006. 

REMARKS. There were 65 samples collected during the 2006 water year. Nine storms were 

sampled with a range of 1–13 samples collected per storm. Chloride reached a period of record 

high concentration in late June 2006 at a discharge of 11.6 ft3

/s. Sample water temperature 

reached a period of record high of 18.8°C at a discharge of 4.0 ft3/s in early August 2006. 
Water-Quality Station Summary

35

01364959 RONDOUT CREEK ABOVE RED BROOK AT PEEKAMOOSE, NY 

SUMMARY STATISTICS, OCTOBER 2005 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 65 65 65 65 65 65 65 65 1 57 65 NA 57 57 65 65 65 65 65 NA Mean 11.1 18.55 5.12 -1.12 1.14 0.38 0.33 0.31 0.42 1.25 0.03 NA 0.58 3.89 3.30 0.85 0.23 0.10 0.04 NA Std Dev 4.0 2.29 0.38 11.58 0.26 0.08 0.12 0.07 0.51 0.04 NA 0.26 0.54 1.72 0.23 0.11 0.07 0.04 NAMedian 12.6 17.78 5.03 -1.24 1.09 0.39 0.29 0.30 0.42 1.27 0.03 NA 0.49 3.85 3.24 0.85 0.22 0.09 0.03 NA Min 1.2 15.54 4.59 -23.95 0.67 0.21 0.18 0.19 0.42 0.02 0.00 NA 0.37 2.83 0.83 0.25 0.06 0.01 0.00 NA Max 18.8 23.80 6.24 41.50 1.95 0.57 0.83 0.50 0.42 2.80 0.36 NA 1.48 4.85 7.19 1.43 0.49 0.28 0.12 NA 

SUMMARY STATISTICS, MAY 1991 TO SEPTEMBER 2006 

Temp°C 

SpecCond. pH ANC Ca2+ Mg2+ K+ Na+ TDN NO3- NH4+ NO2 Cl- SO42- DOC SiO2 Altd Almono Alorg Turbidity 

n 594 642 660 656 653 660 657 658 42 648 442 42 647 649 660 660 411 660 659 NA Mean 9.6 19.85 5.30 1.44 1.36 0.47 0.30 0.35 0.32 1.30 0.03 0.00 0.49 4.55 2.63 0.99 0.21 0.09 0.03 NA Std Dev 4.8 2.32 0.48 14.95 0.36 0.10 0.13 0.10 0.15 0.79 0.05 0.00 0.16 0.68 1.64 0.26 0.14 0.07 0.03 NA Median 10.2 19.45 5.23 0.25 1.33 0.46 0.27 0.34 0.29 1.10 0.02 0.00 0.48 4.59 2.37 0.99 0.19 0.07 0.02 NA Min 0.0 13.05 4.45 -34.80 0.10 0.00 0.06 0.00 0.15 0.00 0.00 0.00 0.17 1.86 0.04 0.22 0.02 0.00 0.00 NA Max 18.8 31.10 6.44 118.84 3.87 0.86 1.00 1.07 0.97 5.03 0.57 0.00 1.48 6.20 15.70 1.96 1.32 0.32 0.18 NA 

 SUMMARY STATISTICS, 

 OCTOBER 2005 TO SEPTEMBER 2006  FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n NA NA NA NACensored NA NA NA NAMean NA NA NA NA Std Dev NA NA NA NA Median NA NA NA NA Min NA NA NA NA Max NA NA NA NA 

 SUMMARY STATISTICS,  MAY 1991 TO SEPTEMBER 2006 

 FOR SOLUTES WITH CENSORED VALUES 

TP TDP SRP SSC 

n NA NA NA NACensored NA NA NA NAMean NA NA NA NA Std Dev NA NA NA NA Median NA NA NA NA Min NA NA NA NA Max NA NA NA NA 
36 U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

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Prepared by the Pembroke Publishing Service Center. 

For additional information write to:

New York Water Science Center

U.S. Geological Survey

425 Jordan Road

Troy, NY 12180

Information requests:

(518) 285-5602

or visit our Web site at:

http://ny.water.usgs.gov
McHale—U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006—Data Series 497