North Lake, Dakota County Minnesota

Report Time Stamp: 2025 September 10 - 16:13 (UTC) ... REPORT LINK

Survey Metadata
Data Collector:	Ray Fish Tester
Survey Time Stamp (UTC):	2022 October 13 - 17:38
Starting Location:	44.836155, -93.125411
Ending Location:	44.837637, -93.126568
Distance	4.634 miles

Survey Statistics
Average Water Temperature:
Survey Area:	20.582 acres
Survey Volume:	131.625 acre ft
Percent of Waterbody Surveyed:	100.0%
Waterbody Area:	20.583 acres
Estimated Waterbody Volume?	131.628 acre ft

Survey Settings
Includes Edited Data:	No
Track Buffer:	25 m
BV Grid Cell Size:	5 m
BV Minimum Detection - Percent:	5.0%
BV Minimum Detection - Depth:	2.400 ft
BV Maximum Detection - Depth:	30.000 ft
BV Sonar Channel:	Primary

Quality Control
Reviewer:	Ian McCormack
Comments:	We have reviewed this trip. Please use the "ASK THE EXPERTS" button for this trip if you have any questions.

Biovolume Summary

Type?	PAC?	Avg BVp?	SD BVp?	Avg BVw?	SD BVw?	Depth Range	Depth Avg	No. Depth Records
Point	67.5%	44.2%	± 40.8%	29.8%	± 38.1%	1.41 - 15.42 ft	7.531 ft	3007
Grid	80.8%	47.5%	± 28.5%	38.4%	± 31.8%	0.16 - 15.36 ft	6.395 ft	6582

Bathymetric Contour Map	Vegetation Biovolume Heat Map
0' 15'

Fish Summary

Type	Total	NumSm?	NumMd?	NumLg?	Depth Range	Depth Avg
Individuals	252	0	23	229	3.35 - 14.50 ft	7.330 ft
Schools?	16	NA	NA	NA	5.25 - 10.99 ft	8.370 ft

Fish Abundance Map	Fish Depth Histogram

Biovolume Analysis by Quintiles

Type?	0 - 20%	20 - 40%	40 - 60%	60 - 80%	80 - 100%
Point	62.4%	13.2%	3.0%	0.3%	21.1%
Grid	38.3%	17.0%	15.5%	14.9%	14.3%

Biovolume Analysis by Depth

Type?	Depth	Count	PAC?	Avg BVp?	SD BVp?	Avg BVw?	SD BVw?
Point	0 - 1 m	282	94.0%	72.7%	± 42.2%	68.3%	± 42.0%
	1 - 2 m	1136	92.3%	44.0%	± 40.7%	40.6%	± 40.5%
	2 - 3 m	252	81.0%	25.5%	± 20.6%	20.7%	± 20.0%
	3 - 4 m	142	57.5%	26.8%	± 21.0%	15.4%	± 17.7%
	4 - 5 m	29	4.5%	22.4%	± 22.2%	1.0%	± 5.9%
	5 - 6 m	0	0%	0%	± 0%	0%	± 0%
	6 - 7 m	0	0%	0%	± 0%	0%	± 0%
	7 - 8 m	0	0%	0%	± 0%	0%	± 0%
	8 - 9 m	0	0%	0%	± 0%	0%	± 0%
	9 m +	0	0%	0%	± 0%	0%	± 0%
Grid	0 - 1 m	1756	100%	68.0%	± 21.4%	68.0%	± 21.4%
	1 - 2 m	2714	98.3%	42.3%	± 27.4%	41.5%	± 27.7%
	2 - 3 m	617	81.0%	28.6%	± 16.1%	23.2%	± 18.3%
	3 - 4 m	429	76.0%	17.4%	± 9.2%	13.2%	± 10.9%
	4 - 5 m	1067	6.6%	12.0%	± 6.8%	0.8%	± 3.5%
	5 - 6 m	0	0%	0%	± 0%	0%	± 0%
	6 - 7 m	0	0%	0%	± 0%	0%	± 0%
	7 - 8 m	0	0%	0%	± 0%	0%	± 0%
	8 - 9 m	0	0%	0%	± 0%	0%	± 0%
	9 m +	0	0%	0%	± 0%	0%	± 0%

Manual Waypoints

You may download waypoints to a CSV file from the waypoints tab in the Trip Viewer.

View Trip

ID	Date	Name	Comments
0	2025-09-10 15:44:39	Fishing Hotspot1	Edge of Weedbed
1	2025-09-10 15:45:35	Fishing Hotspot2	Ugly Tree
2	2025-09-10 15:45:54	Fishing Hotspot3	Georgia Cube
3	2025-09-10 15:46:21	Fishing Hotspot4	Edge of weedbed

Offsets

Trip Name	Trip Date (UTC)	Manual Offset (ft)	Tide Station Name?	Avg Tide (ft)	Min Tide (ft)	Max Tide (ft)	Start Tide (ft)	End Tide (ft)
RDF1835755_NORTH1. ...	2022 October 13 - 17:38	0.000	NA	NA	NA	NA	NA	NA

Glossary

AOI: Area of Interest: Defines the transects or contiguous data samples as depicted by the colored trip line. Seperate areas of interest can be generated through merging of multiple trips, appending data to a single sonar log or lapses in time (greater than five minutes) within a sonar log.
Point: Individual Coordinate Point: A single point represents a summary of sonar pings and the derived bottom and canopy depths. Individual point data create an irregularily spaced dataset that may have overlaps and/or gaps in the data resulting in a increased potential for error.
Grid: Geostatistical Interpolated Grid: Interpolated and evenly spaced values representing kriged (smoothed) output of aggregated data points. The gridded data is most accurate summary of survey areas.
BVp: Biovolume (Plant): Refers to the percentage of the water column taken up by vegetation when vegetation exists. Areas that do not have any vegetation are not taken into consideration for this calculation.
BVw: Biovolume (All water): Refers to the average percentage of the water column taken up by vegetation regardless of whether vegetation exists. In areas where no vegetation exists, a zero value is entered into the calculation, thus reducing the overall biovolume of the entire area covered by the survey.
PAC: Percent Area Covered: Refers to the overall surface area that has vegetation growing.
NumSm: Number of Small Sized Individual Fish: Count of low-energy acoustic backscatter targets which generated an absolute dimensionless value pursuant to our algorithms.
NumMd: Number of Medium Sized Individual Fish: Count of mid-energy acoustic backscatter targets which generated an absolute dimensionless value pursuant to our algorithms.
NumLg: Number of Large Sized Individual Fish: Count of high-energy acoustic backscatter targets which generated an absolute dimensionless value pursuant to our algorithms.
Schools: Aggregations of fish too close together to differentiate individuals.
Type: Individual Coordinate Point: A single point represents a summary of sonar pings and the derived bottom and canopy depths. Individual point data create an irregularily spaced dataset that may have overlaps and/or gaps in the data resulting in a increased potential for error.

Geostatistical Interpolated Grid: Interpolated and evenly spaced values representing kriged (smoothed) output of aggregated data points. The gridded data is most accurate summary of individual survey areas.
Estimated Waterbody Volume: Estimated Waterbody Volume: The total lake volume estimation is based on this dataset only and will depend on total coverage and coverage depths of collected data.
Tide Station Name: Following deprecation and support of WTides, we upgraded our tide solution to Marea Tides that uses the global tide model Finite Element Solution (1 /16º grid; FES2014) to offset depths every minute to MLLW Datum.