Rowing is permitted at the Griggs Reservoir in two distinct seasons. The first season is from October 1st through April 30th and the second season is from May 1st through September 30th.  

October 1st through April 30th:  Rowing is permitted at all times on all days of the week. Any shell or launch on the water before sunrise or after sunset must have lights as specified below.

May 1st through September 30th:  Rowing is permitted/ restricted as follows: 

• No rowing is permitted after sunset
• Rowing is permitted from sunrise through sunset on all weekdays except holidays
• Rowing on weekends and holidays is permitted from sunrise until 10:00 am
• Rowing is permitted one hour before sunrise on weekdays, weekends, and holidays provided the shell has lights as specified below.

Lighting Requirements: 

• A red port and green starboard light on the bow of the boat.
• A white light visible from at least 500 feet on the stern of the boat.

Sunrise/ Sunset Calendar:

This link provides sunrise/ sunset data in a monthly format.   http://www.sunrisesunset.com/custom_srss_calendar.asp 

Traffic Pattern:

For safety reasons, a very specific traffic pattern was established on Griggs. Note, rowers must stay within 100 feet of the shoreline. The river may be crossed only at three points... north of Fishinger Bridge, at the Wall and north and south of the Hayden Run Bridge.    

Traffic Pattern - click here for a detailed map.

Distances and Waypoints on Griggs Reservoir:

Here are the distances between the various landmarks on Griggs.  All measurements were taken proceeding north from GCRA's dock, 50 feet off shore with a GPS receiver accurate within 5 meters or about 15 feet.