Phosphorus

Bimonthly samples are collected from 29 locations: 15 on the Ohio River main stem, and 14 on major tributaries. The samples include suspended solids, sulfate, total hardness, total phosphorus, total organic carbons, ammonia, nitrate/nitrite, total Kjeldahl nitrogen, chlorides, phenolics, and cyanide. In addition to the routine set of parameters collected bimonthly, quarterly analysis for eight total metals are performed on a rotating basis among stations. ORSANCO adopted dual criteria for several inorganic toxicants to protect against chronic (long term) and acute (short term) toxicity to aquatic life. All samples are analyzed at the same laboratory to maintain Quality Assurance/Quality Control protocols. Cyanide analysis are only conducted at eight of the upper-river sites during the months of January, March and November. During warmer months cyanide quickly decomposes into ammonia and carbon dioxide and is rarely detected, and as such, is only analyzed during winter months.

Nutrients

Samples are collected from seven locations twice per month. Analysis includes Total Phosphorus, Total Kjeldahl Nitrogen, Ammonia-Nitrogen and Nitrate/Nitrite-Nitrogen. This information is used in developing nutrient criteria and tracking trends.

Historical data is available from 11 stations. Current data is available from 7 sampling stations. The stations are listed below in order of river mile (upriver to downriver).

Data

Station XLS

Bimonthly Sampling Program

Analytical results of bimonthly samples collected from 31 locations on the Ohio River and its tributaries are listed below. All samples are analyzed at the same laboratory to maintain QA/QC protocols. In addition to the routine set of parameters collected bimonthly, quarterly analyses for five metals are performed on a rotating basis among stations.

2015

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2014

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2013

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2012

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2011

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2010

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2009

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2008

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2007

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2006

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2005

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2004

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2003

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2002

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2001

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