My WebLink
|
Help
|
About
|
Sign Out
Home
2002 Natural Resources Management
Roseville
>
Studies, Task Forces, Special Committees, Reports
>
Parks and Recreation
>
2002 Natural Resources Management
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/13/2012 10:46:09 AM
Creation date
7/13/2012 10:41:05 AM
Metadata
Jump to thumbnail
< previous set
next set >
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
214
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Langton Lake has benefited tremendously from concerted efforts by local residents and the City <br />for its protection. Two efforts that stand out are the successful intervention to prevent filling of <br />the southern part of the Lake in the 1970's, and the construction of a detention basin to treat <br />runoff from much of the new industrial and commercial developments to the south of the lake. <br />The desire to protect Langton Lake was also in large part responsible for passage of a shoreland <br />zoning ordinance by the City in 1974, making Roseville the first city in the state to take such <br />action. <br />Technical Findings <br />Due to a lack of available data for water quality in Langton, the City initiated a limited sampling <br />effort for selected water quality parameters. The sampling was undertaken during the 2001 <br />growing season on June 7th, July 17th and August 23rd. <br />Water Quality <br />Water clarity, measured by secchi depth, often indicates a lake's overall water quality, especially <br />the amount of algae present. Growing season secchi depth for Langton averaged around 2.5 feet <br />in 2001 (Appendix A, Table 1). Generally, sunlight of adequate intensity to support rooted plant <br />growth can penetrate a lake water column to 1.5 -2 times lake secchi depth. This explains to a <br />large extent why almost all of Langton Lake supports lush submergent vegetation since the <br />maximum depth of the Lake, at 5 feet, is only about twice the water clarity reading. <br />The seasonal mean concentration for total phosphorus in Langton is 80 ug /l (ppb) (Appendix A, <br />Table 1). This puts Langton Lake in category D, described in the Metro Lake water quality report <br />card as "poor quality with recreational use severely impaired." It is encouraging however, to note <br />that it is close enough to the upper limit of 69 ug /l in category C (average quality; moderate <br />impairment for recreational use, often in the later half of summer) to make it an achievable goal <br />for the future. <br />There is little historical water quality data for Langton Lake available in the state's water quality <br />database. The Minnesota Pollution Control Agency's (MPCA) lake water quality database <br />indicates that the summer mean water quality reading for the south bay was 1.6 feet in 1984 and <br />City of Roseville 42 <br />Parks Natural Resource Management <br />
The URL can be used to link to this page
Your browser does not support the video tag.