SNAP

Swatara Creek near Hershey, Pa.

Overview
  • Station Id: 01573560
  • County: Dauphin
  • Drainage Area: 484 sq.mi.
  • Station Coordinates: 40.287°, -76.678°
  • Period of record: 10/84 to 12/89 & 10/04 to present
Location Description

10/84-12/89 - Station is located at a bridge 0.7 miles downstream of Route 39 bridge and approximately 100 feet upstream of the confluence of Spring Creek and Swatara Creek bridge near Union Deposit. Gage is located on east bank, 0.5 miles upstream of Route 39 bridge.

Data

2016 Land Use

Urban Agricultural Agricultural Forested Other
Row Crops Pasture/Hay Total
14% 24% 15% 39% 43% 3%
Site Drainage Area

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Clear
2022 Flow Normalized Trends
Trend period (Water Year*) 2005-2022
Trend & Direction NS – Not significant,  UP – Increasing trend,  DOWN – Decreasing trend
Hypothesis Test significance level (i.e. α) 0.1
* Water Year runs from October 1st to September 30th of the following year
Likelihood Descriptor Range of values**
HL (Highly Likely) ≥0.95 and ≤1.00 
VL (Very Likely) ≥0.90 and <0.95 
L (Likely) ≥0.66 and <0.90
ALAN (About as Likely as Not) >0.33 and <0.66
** Values represent the posterior mean estimate of the probability of a trend
Swatara 2005-2022 Flow Normalized Concentration (mg/L) Flow Normalized Load (Millions Kg/yr)
Likelihood Test Likelihood Test
Parameter Change Value Descriptor Trend Change Value Descriptor Trend
Total Nitrogen -1.1525050 0.9901961 HL DWN -0.5718919 0.9901961 HL DWN
Nitrate-Nitrite -1.1930672 0.9901961 HL DWN -0.6786034 0.9901961 HL DWN
Ammonia -0.0224655 0.9705882 HL DWN -0.0150970 0.9117647 VL DWN
Dissolved Nitrogen -1.1816185 0.9901961 HL DWN -0.6040428 0.9901961 HL DWN
Nitrate-Nitrite -1.1467746 0.9901961 HL DWN -0.6242285 0.9901961 HL DWN
Ammonia -0.0216915 0.9705882 HL DWN -0.0149852 0.9117647 VL DWN
Total Phosphorus -0.0070887 0.7549020 L DWN 0.0025117 0.6372549 ALAN NS
Particulate Phosphorus 0.0002594 0.6176471 ALAN NS 0.0000392 0.5392157 ALAN NS
Dissolved Phosphorus -0.0070920 0.8333333 L DWN 0.0031555 0.6176471 ALAN NS
Orthophosphate -0.0057701 0.8529412 L DWN 0.0036223 0.6960784 L UP
Total Organic Carbon -0.1559378 0.6568627 ALAN NS -0.3867452 0.8137255 L DWN
Total Suspended Solids -2.0861576 0.6176471 ALAN NS -11.6233142 0.6764706 L DWN
Suspended Sediment 6.4074125 0.8529412 L UP 0.9872704 0.5784314 ALAN NS