SNAP

Susquehanna River at Marietta, Pa.

Overview
  • Station Id: 01576000
  • County: Lancaster
  • Drainage Area: 25,996 sq.mi.
  • Station Coordinates: 40.029°, -76.518°
  • Period of record: 10/86 to present
Location Description

Sample location is along the Route 30 bridge. The gage is located on the east bank upstream of the Route 30 bridge and 1 mile downstream of Marietta, Pa.

Data

2016 Land Use

Urban Agricultural Agricultural Forested Other
Row Crops Pasture/Hay Total
8% 8% 15% 23% 64% 5%
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*) 1987-2019
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
Marietta 1987-2019 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 -0.745 0.99 HL DOWN -29.094 0.99 HL DOWN
Nitrate-Nitrite -0.276 0.99 HL DOWN -9.108 0.99 HL DOWN
Ammonia -0.034 0.93 VL DOWN -1.521 0.95 HL DOWN
Dissolved Nitrogen -0.533 0.99 HL DOWN -18.818 0.97 HL DOWN
Nitrate-Nitrite -0.276 0.99 HL DOWN -9.564 0.97 HL DOWN
Ammonia -0.036 0.95 HL DOWN -1.541 0.97 HL DOWN
Total Phosphorus -0.054 0.97 HL DOWN -1.836 0.97 HL DOWN
Particulate Phosphorus -0.032 0.97 HL DOWN -1.104 0.89 L DOWN
Dissolved Phosphorus -0.023 0.99 HL DOWN -0.796 0.99 HL DOWN
Orthophosphate 0.004 0.91 VL UP 0.248 0.95 HL UP
Total Organic Carbon -1.095 0.99 HL DOWN -36.431 0.99 HL DOWN
Total Suspended Solids -15.283 0.97 HL DOWN -1623.666 0.97 HL DOWN
Suspended Sediment -25.585 0.99 HL DOWN -1680.952 0.95 HL DOWN