City of Longmont Water Quality Monitoring
Saint Vrain Watershed
Saint Vrain River
Longitudinal Total Alkalinity Profiles for August, 2000

Preliminary Data - subject to revision


Marker Indicates no data available
Marker Indicates data exceeds plot scale.

Information on Total Alkalinity:

Alkalinity refers to how well a water body can neutralize acids. Alkalinity measures the amount of alkaline compounds in water, such as carbonates (CO3 2-), bicarbonates (HCO3 -), and hydroxides (OH-). These compounds are natural buffers that can remove excess hydrogen ions that have been added from sources such as acid rain or acid mine drainage. Alkalinity mitigates or relieves metals toxicity by using available HCO3 - and CO3 2- to take metals out of solution, thus making it unavailable to fish. Alkalinity is affected by the geology of the watershed; watersheds containing limestone will have a higher alkalinity than watersheds where granite is predominant. The Boulder Creek Watershed is composed primarily of granite rocks, thus the water has a lower alkalinity content.

More general information about Total Alkalinity
Measurement of Total Alkalinity
Factors affecting Total Alkalinity
Standards regarding Total Alkalinity
Interpretation of Saint Vrain Total Alkalinity data
Data Source: City of Longmont Water Quality Monitoring
Point of Contact: Sheila Murphy
Collection and Analysis notes
Analysis method: SM 2320B

Indicated monitoring site:

The above map indicates water quality monitoring sites. To view data at a specific site select it from the map with the mouse.


Plot Label SiteName Alk
mg/L as CaCO3
SVAIR St. Vrain River at Airport Road No Data
SVaWWTP St. Vrain River above WWTP Effluent 106
SVaCL St. Vrain River at County Line Road 127
SVaBC St. Vrain River at Boulder Creek No Data
*value below detection limit:
Detection Limit (if available) 1.0

Preliminary Data - subject to revision

Select on the parameter name to view more detailed information for that parameter in this month. Select on the site name to view data time series observed at that station. For monitoring site locations see site location map.

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