Topographic Survey of Select Erosional Features within Fern Ridge Lake, Oregon, 2023 and 2024

Topographic data were collected along select erosional features within or adjacent to channels exposed in Fern Ridge Lake, Oregon, in 2023 and 2024 during low pool. Measurements were focused on features that displayed evidence of past or ongoing fluvial erosion and included landforms such as rills, gulleys and channel segments with knickpoints. The survey data were collected during seasonally low pool levels on January 17, 2023, January 19, 2023, and February 1, 2024, with pool elevations at 109 meters (357 feet), 109 meters (357 feet), and 111 meters (364 feet) (North American Vertical Datum 1988; NAVD 88), respectively. Data collection was opportunistic during other field efforts, and surveys were not meant to systematically map eroding channels or knickpoints in the reservoir, but rather to record general locations and elevations of select erosional features. These data will be used in conjunction with geomorphic mapping and analyses from aerial imagery and other complementary datasets, including digital surface models, to characterize erosional processes within the reservoir. The data were collected using a Trimble R8 and R10 Global Navigation Satellite System (GNSS) receivers and received corrections from the Oregon Real-Time GNSS Network. Data were post-processed with the National Oceanic and Atmospheric Administration’s (NOAA) vertical datum transformation software tool, VDatum, to transform survey points from NAVD 88 GEOID 12b to NAVD 88 GEOID 18 (NOAA, 2024), where necessary. This data release includes corrected survey data from 2023 and 2024 in a comma-delimited text (.csv) file; all coordinates are provided in the projected coordinate system North American Datum 1983 (2011) Universal Transverse Mercator Zone 10 (EPSG:6339), and elevation values are reported in the NAVD 88 datum using the GEOID 18 model. References: National Oceanic and Atmospheric Administration [NOAA], 2024, Vdatum Version 4.7: NOAA, application/service, accessed August 7, 2025, at https://vdatum.noaa.gov/. Rydlund Jr., P., and Densmore, B., 2012, Methods of practice and guidelines for using survey-grade global navigation satellite systems (GNSS) to establish vertical datum in the United States Geological Survey: Report 11-D1, 120 pp., at https://doi.org/10.3133/tm11D1.

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  "010:12"
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[
  "geospatial"
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