SNAP

Susquehanna River at Danville, Pa.

Overview
  • Station Id: 01540500
  • County: Montour
  • Drainage Area: 11,222 sq.mi.
  • Station Coordinates: 40.958°, -76.621°
  • Period of record: 10/84 to present
Location Description

The sampling location is on the Mill Street bridge with the gage located on the west bank, 200 feet upstream of Mill Street bridge.

Data

2016 Land Use

Urban Agricultural Agricultural Forested Other
Row Crops Pasture/Hay Total
8% 4% 21% 25% 61% 6%
Site Drainage Area

Please select a parameter from the list to view graphs of loads and concentrations. You may need to scroll down to view graphs.

Clear
2019 Flow Normalized Trends
Trend period (Water Year*) 1985-2019
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
Danville 1985-2019 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 -0.782 0.99 HL DOWN -13.082 0.99 HL DOWN
Nitrate-Nitrite -0.272 0.99 HL DOWN -4.095 0.99 HL DOWN
Ammonia -0.065 0.99 HL DOWN -1.129 0.99 HL DOWN
Dissolved Nitrogen -0.524 0.99 HL DOWN -8.749 0.99 HL DOWN
Nitrate-Nitrite -0.277 0.97 HL DOWN -4.077 0.97 HL DOWN
Ammonia -0.067 0.99 HL DOWN -1.167 0.99 HL DOWN
Total Phosphorus -0.055 0.99 HL DOWN -0.507 0.95 HL DOWN
Particulate Phosphorus -0.033 0.99 HL DOWN -0.083 0.74 L DOWN
Dissolved Phosphorus -0.024 0.99 HL DOWN -0.409 0.99 HL DOWN
Orthophosphate -0.005 0.93 VL DOWN -0.061 0.56 ALAN NS
Total Organic Carbon -1.849 0.99 HL DOWN -29.032 0.99 HL DOWN
Total Suspended Solids 5.943 0.68 L UP 630.370 0.83 L UP
Suspended Sediment -19.180 0.99 HL DOWN -489.582 0.83 L DOWN