The Watershed Health Monitoring (WHM) program sampled randomly selected streams in each of 7 Status and Trends Regions during the 2009-2012 index period. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in the Upper Columbia Status and Trends Region during 2012. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.

The Watershed Health Monitroring (WHM) program sampled randomly selected streams in the Upper Columbia Status and Trends Region during 2012. We used Generalized Random Tesselation Stratefied (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in the Upper Columbia Status and Trends Region during 2012. We used a Generalized Random Tessellation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in the Upper Columbia Status and Trends Region during 2012. We used a Generalized Random Tessellation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in each of 7 Status and Trends Regions during the 2009-2012 index period. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in each of 7 Status and Trends Regions during the 2009-2012 index period. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in the Upper Columbia Status and Trends Region during 2012. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.

The Watershed Health Monitoring (WHM) program sampled randomly selected streams in each of 7 Status and Trends Regions during the 2009-2012 index period. We used a Generalized Random Tesselation Stratified (GRTS) stream survey.