Start date: 06/24/2023

Registration: opens 05/01/2023
Activity tags attached to this sportie.

Activities: Time trial 🚴🏿‍♂️, 50 km, 25 km

GID: 60845

That Dam TT is a time trial race in Baltimore County. The race is a challenging time trial around the Prettyboy Reservoir watershed. All proceeds from the race are donated to the National Multiple Sclerosis Society - Maryland Chapter.


The race is held on a technical 25K circuit featuring 1,573 feet of elevation gain. There is a maximum grade of 10.2% although the climbs average closer to 6%. There are many winding descents.

All categories are offered for Men and Women. Medals will be awarded to top 3 finishers in each category.


Please note if your race is 1 or 2 laps prior to registering.

1 Lap Races include:

Juniors 11-12, 13-14, 15-16, 17-18

Merckx Open (no 1, 2, or 3 annual licenses)

Senior Category 4, Senior Category 5

Masters 65+


2 Lap Races include:

Senior Category 1/2/3, 3

Masters 35+, 45+, and 55+


Race runs rain or shine. In the event of heavy rain all races will be 1 lap.


The first racer will start at 9:00am. Riders will be sent off by category. Exact start times are dependent on the number of registrants, and will be announced by 2pm on Friday, June 23rd.


Official results will be provided digitally once available from officials.


$35 by May 31, $40 as of June 1

$20 for Juniors. 

Annual or One-Day USA Cycling License is required. If a One-Day license is required, the $15 fee will be charged at registration. One day licensees may enter Cat 5 or their appropriate age graded category. 


There is no day of registration.


If you would like to warm up, please bring a trainer. There will be no warming up on Rayville Road or on the race course.


Roads will be open to traffic during the race. Obey all traffic regulations; yellow line rule is in effect and strictly enforced. Littering on the course is prohibited; as we are on the watershed violators will face a race relegation. 


The nearest address is 1717 Rayville Road, Parkton, MD 21120. Parking will be just north of Spooks Hill Road.


All USAC rules apply. 

Riders must wear helmets at all times. 

Juniors 11-14 may not use aero TT bikes.

100% of race proceeds benenefit the National MS Society - Greater Maryland/DC Chapter


Race Support Presented by

Sponsorship Provided by

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