Summer 2016 Waterfront Statistics

Water Temperatures: Summer 2016 was among the warmer summers in recent years. From June 18 to August 15 the average water temperature was 74.0˚; this compares to 71.4˚ in 2015. Looked at in 2-week increments, water temperatures increased steadily from a mild June through an exceptionally warm August: June 18-30 = 69.5˚; July 1-15 = 72.6˚; July 16-31 = 75.6˚; Aug 1-15 = 78.1˚. High recorded water temperature was 80˚ on August 15.

Swimmer’s Itch: Swimmer’s itch data from 2016 were largely consistent with findings from recent years.

  • Overall, for 51 days from June 18-August 15 there were no reports of itch on 36 (70.6%). This compares with 74% of days with no itch in 2015, 53% in 2014, 67% in 2013, and 64% in 2012.
  • Onshore (northerly) winds were reported on 21 days (41.2%); these days accounted for 80% of all days with at least one reported case (12/15) and 100% of days with 10 or more reported cases (7/7). There were reports of itch on 57% of onshore wind days (12/21).
  • Offshore (southerly) winds were reported on 25 days (49%); these days accounted for 13% of days with at least one reported case of itch (2/15) but only 3 reported cases of itch overall. There were reports of itch on 8% of offshore wind days (2/25).
  • There were 233 reported itch cases among 1509 estimated swimmers on days with onshore winds (15.4% incidence); 3 cases of itch were reported among the 2646 estimated swimmers on days with offshore winds (.01% incidence); 9 cases among 467 swimmers on days with an east wind (1.9% incidence); and 0 cases among 399 swimmers on days with a west wind. Overall incidence was 4.9% (245 reported cases among 5021 estimated swimmers).
  • Although estimating the number of swimmers in the water is particularly problematic, it is interesting to note that the data show about 47% more swimmers in the water on days with offshore (southerly) winds than onshore (106 swimmers/day versus 72). This is not surprising given both the cold wind and waves of some north-wind days and the likelihood that awareness of the association of onshore winds and itch is changing swimming behavior.


The CSA has 2 waterfront areas for use by members – Crystal Lake and Lake Michigan.

Swimming Lessons at Crystal Lake are Monday through Friday at the following times:

10:00 am Levels 1-2 Beginners

10:30 am Levels 3-7 Advanced

11:00 am Levels 3-7 Advanced

11:30 am Levels 1-2 Beginners

Crystal Lake Rules: Crystal is a non-smoking beach

1. Trained lifeguards are on duty between the hours of 1:00 and 5:00 pm, and only when their presence is indicated by a Red Cross flag at the top of the beach flagstaff.

2. All trash must be deposited in the receptacles provided. All disposable diapers must be taken back to your cottage.

3. Bonfires are not permitted on the Crystal Lake Beach except at the designated fire pit below the Crystal View.

4. Dogs and other animals must not be brought onto the beach at any time.

5. Beer and alcoholic beverages are forbidden on the beach.

6. Radios are allowed only with personal earphones.

7. Use of cellphones is strongly discouraged.

Lake Michigan Rules:

1. Everyone must stay off the dunes. Use the boardwalk near the swing set and wooden staircase to access the beach. 

2. All trash must be places in containers provided or taken back to your cottage.

3. The use of glass containers is prohibited on the beach.

4. Dogs must be on a leash on the CSA Michigan beach and all animal waste must be picked up by the owners for proper disposal.

5. Participants at beach parties are expected to keep noise (radios, voices, singing) at a reasonable and courteous level. Strict quiet hours are posted from 11:00 pm – 8:00 am. 

6. No alcoholic beverages, illegal drugs or fireworks are allowed on the beach.

7. Fire Rules:

* Firewood may be gathered from the beach or taken down from your cottage supply. It is prohibited to climb the dunes to pull out dead tree roots or other wood for your fire.

* Fire sites are to be established and left for the next group to use again whenever possible.

* Fires must be doused with water prior to abandoning them.