Water quality data are used to characterize waters, detect trends over time, and identify emerging problems. In Southern Colorado Plateau Network (SCPN) parks, water quality is monitored as an indicator of aquatic ecosystem integrity, as a component of watershed condition, and to document water quality conditions in relation to state and federal regulations.

A gloved staff person crouches by a stream, collecting a water sample
Collecting water quality data at Tsaile Creek in Canyon De Chelly National Monument.

NPS

Perennial streams are rare on the Colorado Plateau, and most streams in the region are intermittent or ephemeral, and remote. As a result, water quality data on SCPN streams are sparse. However, managers need information on status and trends for streams in their parks in order to develop plans and take actions to maintain or restore surface water quality, as well as to work cooperatively with other agencies to protect park waters. SCPN monitoring efforts will add park data to ongoing state water quality monitoring programs, thus contributing to a broader regional understanding of aquatic conditions.

Long-term Monitoring

Water quality is monitored quarterly at selected streams in five SCPN parks. Core parameter data, including temperature, pH, specific conductance, dissolved oxygen, turbidity, and discharge, are collected at all monitoring sites. Additionally, samples are collected to determine the status and trends of water quality constituents, including bacteria, nutrients, major ions and trace metals. Aquatic macroinvertebrate samples are also collected at several sites. Pilot studies were initiated in 2007 and water quality monitoring was implemented in 2010.

SCPN Park units monitored for water quality

Park

Streams

Bandelier NM

Capulin Creek, Rito de los Frijoles

Canyon de Chelly NM

Tsaile Creek, Chinle Wash

Glen Canyon NRA

Escalante River, Coyote Gulch

Grand Canyon NP

Bright Angel Creek, Garden Creek

Mesa Verde NP

Mancos River

Management Applications

Water quality in streams is influenced by physical conditions, including geology and vegetation, and may be altered by natural disturbance events, such as catastrophic fire, flooding, or drought, or by a variety of anthropogenic activities. Significant contamination of surface waters can be harmful to aquatic biota and may pose health risks to recreational visitors. The first few years of water quality data collection will document current conditions in SCPN streams. Over the long term, this data will be used to meet objectives that include (1) protecting water bodies under the provisions of the Clean Water Act, (2) documenting water quality parameters that are vulnerable to alteration from various sources of contamination or land-use practices, and (3) establishing which water quality parameters may be most useful for indicating ecosystem integrity of streams in SCPN parks.

Graph showing monthly data for E. coli and total coliforms from the Mancos River
SCPN collects water samples for bacterial analysis. This figure presents monthly data for E. coli and total coliforms from the Mancos River in Mesa Verde NP, 2010.

For More Information

Reports & Publications

https://science.nature.nps.gov/im/units/scpn/monitor/waterQuality.cfm

Contact

Stacy Stumpf, Stacy_Stumpf@nps.gov

 

Prepared by the Southern Colorado Plateau Network Inventory and Monitoring Program, 2012.