City of Boulder Storm Water Quality Program
Boulder Creek Watershed
Turbidity Time Series for 1999
Boulder Creek Below Coal Creek

Preliminary Data - subject to revision

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

Information on Turbidity:

Turbidity is a measure of the cloudiness of the water. Cloudiness is caused by suspended solids or organic matter including silt, microorganisms, plant fibers, sawdust chemicals and coal dust. High levels of turbidity can block light from reaching submerged aquatic vegetation and can raise surface water temperatures because the suspended particles absorb heat from sunlight. The most frequent causes of turbidity are from logging, road and building construction, and mining activity. Turbidity affects fish by decreasing light penetration thus reducing the amount of photosynthesis taking place in the water. This reduces the amount of oxygen available to fish. Large amounts of suspended solids can also clog fish gills, and it affects their ability to see and catch foo

More general information about Turbidity
Measurement of Turbidity
Factors affecting Turbidity
Standards regarding Turbidity
Interpretation of Boulder Creek Turbidity data
Data Source: City of Boulder Water Quality Monitoring
Point of Contact: Chris Rudkin
Collection and Analysis notes
Analysis method: Hach 2100N

Monitoring site information:
BC-bCC Map
BC-bCC Photo
  • Location: Boulder Creek Below Coal Creek
  • Name: BC-bCC
  • Type: Composite
  • Frequency: Monthly
  • Longitude: 105 ° W 34'
  • Latitude: 40 ° N 50'
  • Elevation: 4955 feet asl
  • Site photo
Downstream Site: North Boulder Creek diversion to Lakewood
Upstream Site: Boulder Creek Above Coal Creek

Plot Label Date Turb
01 January, 1999 No Data
02 February, 1999 No Data
03 March, 1999 No Data
04 April, 1999 No Data
05 May, 1999 No Data
06 June, 1999 No Data
07 July, 1999 No Data
08 August, 1999 No Data
09 September, 1999 No Data
10 October, 1999 No Data
11 November, 1999 No Data
12 December, 1999 No Data
*value below detection limit:
Detection Limit (if available) 0.01

Preliminary Data - subject to revision

Select on the parameter name to view all Turbidity time series plots on the basin map. Select on the table date to view stream Turbidity profiles observed on that date. Select here to view all parameters at this site.

Return to the BASIN water quality catalog

Return to the BASIN environmental data catalog

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Last Page Update - Friday December 23, 2005
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