City of Boulder Drinking Water Quality Program
Boulder Creek Watershed
Ortho-phosphate Time Series for 1999
Little Dry Creek
Preliminary Data - subject to revision
Marker Indicates no data available
Marker Indicates data exceeds plot scale.
Information on Ortho-phosphate:

Phosphorus in natural waters is usually found in the form of phosphates (PO4-3). Phosphates can be in inorganic form (including orthophosphates and polyphosphates), or organic form (organically-bound phosphates). Orthophosphate is sometimes referred to as "reactive phosphorus." Orthophosphate is the most stable kind of phosphate, and is the form used by plants. Orthophosphate is produced by natural processes and is found in sewage.

More general information about Ortho-phosphate
Measurement of Ortho-phosphate
Factors affecting Ortho-phosphate
Standards regarding Ortho-phosphate
Interpretation of Boulder Creek Ortho-phosphate data
Data Source:
Point of Contact:
Collection and Analysis notes
Analysis method: SM 4500-P E
Monitoring site information:
LDC Map
  • Location: Little Dry Creek
  • Name: LDC
  • Type: Composite
  • Frequency: Monthly
  • Longitude: 105 ° W 14'
  • Latitude: 40 ° N 45'
  • Elevation: feet asl
  • Site photo
Plot Label Date OP_Dis
mg/L as P
01 January, 1999 0.00*
02 February, 1999 0.00*
03 March, 1999 0.00*
04 April, 1999 0.00*
05 May, 1999 0.00*
06 June, 1999 0.00*
07 July, 1999 0.00*
08 August, 1999 0.00*
09 September, 1999 0.00*
10 October, 1999 0.00*
11 November, 1999 0.00*
12 December, 1999 0.00*
*value below detection limit:
Detection Limit (if available) 0.03
Preliminary Data - subject to revision
Select on the parameter name to view all Ortho-phosphate time series plots on the basin map. Select on the table date to view stream Ortho-phosphate profiles observed on that date. Select here to view all parameters at this site.

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