Survey context: A CLP plant specimen was recovered during gill net operations on Grace Lake in July 2025. Two areas are identified for in-water search based on gill net endpoint coordinates. Each search area is defined as a circle with a 250-foot diameter (125-foot radius), centered at the midpoint between each gill net's two endpoint coordinates.
Gill Net 7 — Primary search site
Gill Net 3 — Alternative search site
Gill net endpoints (hollow dots)
● Gill Net 7 — Primary Search Area
| Parameter | End 1 | End 2 | Circle Center (midpoint) |
|---|
| UTM Easting | 369,070 | 369,072 | 369,071 |
| UTM Northing | 5,251,620 | 5,251,696 | 5,251,658 |
| Search Circle | Value |
|---|
| Diameter | 250 feet |
| Radius | 125 feet (38.1 meters) |
| Zone | UTM Zone 15N |
● Gill Net 3 — Alternative Search Area
| Parameter | End 1 | End 2 | Circle Center (midpoint) |
|---|
| UTM Easting | 368,428 | 368,436 | 368,432 |
| UTM Northing | 5,252,872 | 5,252,788 | 5,252,830 |
| Search Circle | Value |
|---|
| Diameter | 250 feet |
| Radius | 125 feet (38.1 meters) |
| Zone | UTM Zone 15N |
Search Priority & Rationale
Gill Net 7 (primary): The CLP specimen was directly recovered from this net. The search circle represents the possible growing location of the plant — it could have been growing anywhere within the 250-foot diameter area centered on the net's midpoint.
Gill Net 3 (alternative): This net was lifted approximately 5 minutes before GN7. There is a possibility that vegetation fell from GN3 into the boat and was inadvertently scooped up when GN7 was brought in. This area is also recommended for inspection.
Map data © OpenStreetMap contributors · Coordinate system: UTM Zone 15N, WGS84 · Generated for Grace Lake CLP survey