The Lake Clarity Crediting Program is the source for much of the Performance Measure data on the Stormwater Management Program.
The goal of the stormwater management program is to reduce the amount of fine sediment particles entering Lake Tahoe. Stormwater management consists of the following four programs:
• Reducing Stormwater Pollution from City and County Roads
• Reducing Stormwater Pollution from State Highways
• Reducing Stormwater Pollution from Forest Roads
• Retrofitting Public and Private Facilities with Best Management Practices
Stormwater management projects incorporate stormwater drainage conveyance, treatment facilities, and source control measures for effectively reducing runoff and improving Lake water quality. Property/easement acquisitions and public-private partnerships are important elements of these projects because in many cases sufficient space does not exist within road rights-of-way for water quality projects to be constructed. Improved project level monitoring will help evaluate the effectiveness of different stormwater strategies and improve project implementation in the future. For example, studies are underway to explore area-wide runoff treatment systems which could be used in the future.
The Lake Tahoe TMDL program was developed to restore Lake Tahoe’s clarity. The program tracks the three pollutants responsible for clarity loss: fine sediment particles, total phosphorus, and total nitrogen.
For more Lake Tahoe TMDL implementation information, go to: https://clarity.laketahoeinfo.org
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Some projects operate over larger areas and are not represented on the map, but are listed in the project grid below. A full-screen, filterable version of this map is also available.
The estimated amount of fine sediment prevented from entering Tahoe Basin urban stormwater, based on the guidelines laid out in the Lake Clarity Crediting Program Handbook. Fine sediment load is quantified in terms of the number of sediment particles with diameter of less than 16 micrometers. Reduction of fine sediment load benefits Lake Tahoe's clarity.
The estimated amount of nitrogen prevented from entering Tahoe Basin urban stormwater, based on the guidelines laid out in the Lake Clarity Crediting Program Handbook. The nitrogen load reduction is defined as the number of kilograms of nitrogen prevented from entering the lake. Reduction in nitrogen reduces the growth of algae and improves Lake Tahoe clarity.
The estimated amount of phosphorus prevented from entering Tahoe Basin urban stormwater, based on the guidelines laid out in the Lake Clarity Crediting Program Handbook. Phosphorus load reduction is defined as the number of kilograms of phosphorus removed. Reduction in phosphorus reduces the growth of algae and improves Lake Tahoe clarity.
Data displayed currently includes improvements accomplished by TMDL Urban Implementing Partners. TMDL Management Agencies are working on update to display only accomplishments completed on non-urban roads.
The amount of forestland roads that are retrofitted or obliterated to reduce stormwater pollution through capital improvements. This PM is reported in three categories of treatment priority based on water quality risk. Treating high-priority roads reduces stormwater pollution and cost-effectively improves the clarity of Lake Tahoe.
Miles of city, county and state roads that are swept to reduce stormwater pollution during each EIP reporting year as part of regular operations and maintenance procedures. Capital stormwater infrastructure improvement activities are captured by other PMs. Sweeping streets reduces a major source of pollutants in stormwater runoff that flows to Lake Tahoe and works toward reducing clarity loss.