Name: Aquatic Invasive Plants Control Sites

Display Field: Site_Name

Type: Feature Layer

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Description: This shapefile contains records for aquatic invasive plant control projects in the Lake Tahoe Basin Region. This dataset does not include historic infestation sites. Points are generalized and in some cases multiple small, discrete populations may be grouped as a single control site for planning logistics. Data should be interpreted with this in mind. Attributes are listed for aquatic invasive plant species detected at each location, plant (infestation) status, and management (infest) status and control methods implemented in 2019, 2020, 2021, 2022, 2023. Confirmation of species and status was obtained during contracted dive team during field visits. Development of status categories is ongoing and subject to change in future updates to this dataset. Abbreviation Definitions:EWM = Eurasian watermilfoil CLP = curly-leaf pondweedNZM = New Zealand mudsnailInvPlantSp = Aquatic Invasive Plant SpeciesContr = Control Methods DAS = diver assisted suctionSM or surveillance = surveillance monitoringSA = site assessmentMMP SA = Marina Management Plant Site Assessment (different boundary)SA w NZM = Site Assessment with addition of divers tasked with detecting NZM in survey boundary with a focus on future treatment areasInfest_Sta = This attribute describes the management status of the infestation site. This status incorporates current treatment needed, diver effort, and current funding to prioritize planning efforts and future funding. This status does not indicate the amount of plants, level of establishment, or threat level of an infestation. P1- Planning 1: "Passive" Known or possible infestation. Information regarding the location may be insufficient, access to the site may be blocked, or a funding strategy for future treatment has not yet been established. If there is a funding lapse in a control or surveillance project, those sites will be changed to this category until funding plan is resolved.P2 - Planning 2: "Active" Known infestation. Active planning and/or procurement of funds are being actively implemented. Site Assessments, coordination with land owners, Containment, marina-led maintence treatment, or pilot methods testing projects may be being implemented. Active control methods (barriers, diver-assisted suction, UV-C, or dredging) will likely be needed to treat this site. C1 - Infestation Active Control 1: Known infestation. Active control methods (barriers, diver-assisted suction, UV-C, dredging, site preparation, or methods testing) were implemented over the course of the season. C2 - Infestation Hand Removal 2: First time or previously treated control site that only required hand removal to maintain the weed-free status. Over the course of one season, surveillance visits utilizing hand removal may require substantial effort (20 diver hours) beyond the baseline expected surveillance effort. EDRR sites that are discovered and treated with only hand removal during the season will remain in this category until they are accomodated for in the Surveillance Monitoring plan. S1 - Surveillance Higher Risk 1: Previously treated control site. Over the course of one season, no more than 20 divers hours over the expected surveillance effort was required at this site to maintain weed free status.S2 - Surveillance Lower Risk 2: Historic infestation site. AIP have been treated and/or detected in this location. Consecutive surveys over the course of at least three years have shown no detections. Plant_Stat - this attribute describes the general status of the plant establishment at an infestation site. It is a binary attribute to distinguish between established infestations and infestations that have been completely treated and contain little to no plants. Established Infestation = This indicates a location where aquatic invasive plants are known to be established. This is either because it has not yet been treated, it has only been partially treated, or a high volume of plants return after treatment. It does not indicate whether control work is currently taking place at this location. Surveillance= This indicates a location where aquatic invasive plants have been previously treated. Little to minimal regrowth has been documented. Projection: NAD_1983_CORS96_UTM_Zone_11N, Transverse MercatorDatum: D_NAD_1983_CORS96

Service Item Id: 8a0325246ab44159adbaf6e070f5becb

Copyright Text: Sara Matthews, Tahoe Resource Conservation District (Tahoe RCD)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: FID )
• Site_Name ( type: esriFieldTypeString, alias: Site_Name, length: 50 )
• Threshold_Status_2023 ( type: esriFieldTypeString, alias: Threshold_Status_2023, length: 255 )
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