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Overview
Basics
Basics
Emerald Bay is one of the most successful aquatic invasive plant (AIP) control treatments completed to date by the Lake Tahoe AIS program. Zero to few aquatic invasive plants had been detected since 2014, until recent surveillance monitoring in 2022 revealed AIP that required a higher level of work that was no longer considered a rapid response action. Dedicated treatment includes diver-assisted suction removal and hand-pulling. To ensure the long-term effectiveness of this work, routine surveillance monitoring is occuring, and training of California Department of State Parks divers to conduct annual monitoring and removal of any emerging aquatic invasive plants.
Implementation
2022
2023
2026
$300,000
Mollie Hurt (mhurt@tahoercd.org)
01/02/2024
02/02/2026
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| Location Information | Location Notes |
|---|---|
Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
Performance Measures
Expected Performance Measures
Expected Performance Measures
| Acres Treated for Invasive Species | [Invasive Species Type: Aquatic] | 22.43 | acres |
| Acres of Invasive Species Inventoried | [Invasive Species Type: Aquatic] | 48.2 | acres |
Reported Performance Measures
Reported Performance Measures
| Acres Treated for Invasive Species | |||||
|---|---|---|---|---|---|
| 2023 | 2024 | 2025 | Total | Units | |
| Invasive Species Type | |||||
| Aquatic | 21.5 | 4 | 1.67 | 27.17 | acres |
| Total | 21.5 | 4 | 1.67 | 27.17 | acres |
| Acres of Invasive Species Inventoried | |||||
|---|---|---|---|---|---|
| 2023 | 2024 | 2025 | Total | Units | |
| Invasive Species Type | |||||
| Aquatic | 48 | 48 | 64.84 | 160.84 | acres |
| Total | 48 | 48 | 64.84 | 160.84 | acres |
Funding
Expected Funding
Expected Funding
$300,000
$300,000
$0
| Total | |||
|---|---|---|---|
| Tahoe Fund (Tahoe Fund) | $50,000 | $50,000 | $0 |
| Tahoe Regional Planning Agency (TRPA) | $250,000 | $250,000 | $0 |
| Grand Total | $300,000 | $300,000 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2025 | 2024 | 2023 | 2022 | |
|---|---|---|---|---|---|
| Lake Tahoe Restoration Act | $213,000 | $48,000 | $65,000 | $100,000 | $0 |
| Tahoe Fund | $50,000 | $0 | $0 | $50,000 | $0 |
| Grand Total | $263,000 | $48,000 | $65,000 | $150,000 | $0 |
Photos
Figure 1. Marine Taxonomic Services boat, safety equipment, and turbidity curtain during diver-assisted suction, September 2023, Emerald Bay, Lake Tahoe, El Dorado County, CA.
(Timing: During) (~4,092 KB)
Figure 2. Topside crew removes AIP material from metal grate into bins on boat during diver-assisted suction removal, September 2023, Emerald Bay, Lake Tahoe, El Dorado County, CA.
(Timing: During) (~2,999 KB)
Figure 3. Diver conducts diver-assisted suction removal of Eurasian watermilfoil, September 2023, Emerald Bay, Lake Tahoe, El Dorado County, CA.
(Timing: During) (~1,594 KB)
Figure 4. Divers conducting site assessment at Emerald Bay, May 2025.
(Timing: During) (~858 KB)
Figure 5. Diver conducting surveillance monitoring and aquatic invasive plant removal at Emerald Bay, July 2025.
(Timing: During) (~891 KB)
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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Removal of invasive plants will make the nearshore habitat less suitable for reproduction and survival of non-native warm water fish (that exhibit lower reproductive success) when exposed to high levels of UV light), thereby restoring and enhancing native fish species habitat.
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Removal of aquatic invasive plants in the nearshore will contribute to providing a high quality recreation experience in the nearshore.
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It has been demonstrated that satellite populations increase the rate of expansion of an invasion and targeting such populations for reduction can act to reduce spread rates, thereby reducing aesthetic and visual impacts in the nearshore.
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Eurasian watermilfoil has been found to alter phosphorous cycling in the water column in the nearshore of Lake Tahoe, potentially leading to increased algae production. Benefits to water quality will also be realized due to the resultant decline in CDOM (colored dissolved organic material) levels, which would indicate a reduction in the amount of decompositon of organic matter.
Local and Regional Plans
Related Projects
Related Projects
01.03.01.0041 - Emerald Bay Aquatic Invasive Plant Control is associated with following groups of projects.
External Links
No external links entered.
Notes
Notes
| 12/29/2023 4:04 PM | Mollie Hurt | This site is expected to require only hand removal in 2024 and will remain in the C2 (Control – hand removal) management category. |