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
2021 Flow Normalized Trends
Trend period (Water Year*) 1987-2021
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 1987-2021 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 -0.7553205 0.9901961 HL DN -30.3271496 0.9901961 HL DN
Nitrate-Nitrite -0.2799826 0.9901961 HL DN -10.1481245 0.9901961 HL DN
Ammonia -0.0418488 0.9705882 HL DN -1.8238280 0.9509804 HL DN
Dissolved Nitrogen -0.5509926 0.9901961 HL DN -20.0089123 0.9901961 HL DN
Nitrate-Nitrite -0.2793836 0.9901961 HL DN -10.5606360 0.9901961 HL DN
Ammonia -0.0433684 0.9901961 HL DN -1.8402985 0.9901961 HL DN
Total Phosphorus -0.0567697 0.9901961 HL DN -1.8818003 0.9901961 HL DN
Particulate Phosphorus -0.0327484 0.9901961 HL DN -1.0603437 0.8529412 L DN
Dissolved Phosphorus -0.0246938 0.9901961 HL DN -0.8621365 0.9901961 HL DN
Orthophosphate 0.0025820 0.8921569 L UP 0.1584492 0.9509804 HL UP
Total Organic Carbon -1.1862527 0.9901961 HL DN -41.2756005 0.9901961 HL DN
Total Suspended Solids -15.1941126 0.9705882 HL DN -1409.2718889 0.9509804 HL DN
Suspended Sediment -26.1956696 0.9901961 HL DN -1598.0556147 0.9117647 VL DN