Cogswell, north of

Survey Citation:
Drilling. N. E. 2015. North Dakota Colonial and Semi-colonial Waterbird Inventory, 2014-2015. Final Report. Tech. Rpt. SC-NDCWB02. Bird Conservancy of the Rockies, Brighton, CO, USA. 57 pp.

• Type
  shore; boat; air
• Time period
  2014 or 2015
• Source
  Report
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	101 to 500	210	2014 or 2015
Most Recent Adults	101 to 500	210	2014 or 2015
Max Nests	1 to 100	28 avg for county	2014 or 2015
Most Recent Nests	1 to 100	28 avg for county	2014 or 2015
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

Survey methods are generalized across the different grebe breeding lakes because they were not specified per lake but an aerial survey was initially conducted. Survey was at least once in 2014 or 2015 with no further detail on each lake. Grebe breeding pair totals per county and per lake is reported. Entered is the grebe breeding pair total per breeding lake X2 for an estimation of adults numbers. Average colony size for Sargent County is entered but no nest numbers per breeding lake is reported.

Survey Citation:
Igl, L. 2023. Pers. comm.

• Time period
  N/A
• Source
  Personal communication
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	1 to 100	presence	?
Most Recent Adults	1 to 100	presence	?
Max Nests	1 to 100	presence	?
Most Recent Nests	1 to 100	presence	?
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

Larry Igl confirms that Western grebe (or Western and Clark's grebe) colonies were at this lake in the past. No years nor further details or whether grebes still breed there. Larry believes that there are probably more ND lakes than is listed here that support grebe colonies.