Heron Lake

Survey Citation:
Pfannmuller, L., G. Niemi, J. Green, B. Sample, N. Walton, E. Zlonis, T. Brown, A. Bracey, G. Host, J. Reed, K. Rewinkel, and N. Will. 2017. The First Minnesota Breeding Bird Atlas (2009-2013).

• Time period
  late 1800s, 1923
• Source
  Atlas
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	1 to 100	presence	late 1800s-1923
Most Recent Adults	1 to 100	presence	1923
Max Nests	1 to 100	2	late 1800s
Most Recent Nests	1 to 100	2	late 1800s
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

Historic account of 2 nests here in the late 1800s. Birds were observed here until 1923. No other details.

Survey Citation:
Koster, Susan K. 1995. 1995 Heron Lake Colonial Waterbird Survey. Report to the Minnesota Department of Natural Resources. http://files.dnr.state.mn.us/eco/nongame/projects/consgrant_reports/1995/1995_heronlake.pdf

• Type
  shore; boat; air
• Time period
  1992, 1995
• Source
  Report
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	101 to 500	140	1992
Most Recent Adults	1 to 100	60	1995
Max Nests	1 to 100	presence	sometime btwn 1992-1995
Most Recent Nests	1 to 100	presence	sometime btwn 1992-1995
Max Chicks	1 to 100	presence	sometime btwn 1992-1995
Most Recent Chicks	1 to 100	presence	sometime btwn 1992-1995

Comments:

Broods were observed but no numbers nor year provided.

Survey Citation:
Henderson, Carroll L. 1977. Minnesota Colonial Bird Nesting Site Inventory. St. Paul: Minnesota Department of Natural Resources. http://files.dnr.state.mn.us/eco/nongame/projects/consgrant_reports/1977/1977_colonial_birds.pdf. AND Henderson, Carroll L. 1978. Minnesota Colonial Bird Nesting Site Inventory. St. Paul: Minnesota Department of Natural Resources.

• Time period
  1977, August 1980?
• Source
  Report
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	see comments	?	?
Most Recent Adults	1 to 100	?	1978
Max Nests	N/A	?	?
Most Recent Nests	N/A	?	1978
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

The Minnesota Colonial Waterbird Nesting Inventory was conducted by the Minnesota Department of Natural Resources from 1977 to 1980. The reports include Western grebe colony counts of each year (except 1979) but only 1977 and 1978 have individual breeding lake survey numbers. This record just states this lake as a breeding lake in 1977 with no numbers. The 1978 report does not report this lake's Western grebe numbers for the year 1978 status is uncertain at this lake. The 1980 report summarizes colony status for 5 colonies but does not name them so is entered here as a statewide entry with no breeding lakes named. Breeding lake status is indicated as evidence of breeding either as observed nests and/or chicks. If not observed, nests are assumed to be present.