I hope this message finds you well, present circumstances excluded. I am a licensed attorney with over a decade of experience handling ADA related matters, such as this one. It is a pleasure to assist you today.
The answer CAN depend on how old the facility is, or when it was built. The Americans with Disabilities Act (ADA) requires new stadiums to be accessible to people with disabilities so they, their families, and friends can enjoy equal access to entertainment, recreation, and leisure.
That said, since this is a public facility, and not a private stadium, you do have the ability to file a complaint. The 2010 ADA standard on this issue went into effect in 2012 nationally. There are two changes to the law that have relevance to your situation. Here they are:
3. Cross Slope and Level Landings
Description: Accessible routes with cross slope and level-landing requirements will be permitted to slope a maximum of 1:48 (2.1%)
Change from previous standard: Maximum slope of 1:50 (2.0%)
Effective date: January 1, 2014
Original source: Multiple 2010 ADA code citations for cross slope and level landings. Relevant 2013 CBC code citations: Multiple code citations for cross slope and level landings.
Notes: This change is made to maintain consistency with the International Building Code/ANSI standards. A Smart Level is accurate to within 0.1%. Previously, a slope measurement would require a 2.2% to be definitively considered as noncompliant (outside the range for margin of error), but this would now be a 2.3% measurement.
4. Accessible Route: Areas of Sport Activity
Description: An accessible route must be provided to connect to the boundary of each area of sports activity.
Change from previous standard: The previous general requirement for accessibility is now a specific code citation to require accessible routes to sports areas.
Effective date: March 15, 2012
Original source: 2010 ADA Advisory 206.2.2
Relevant 2013 CBC code citations: Section 11B-206.2.18 and 11B-206.2.12
Notes: As referenced in the 2010 ADA Advisory statement, this includes soccer fields, basketball courts, baseball fields, running tracks, tennis courts or other areas of school sports activity. Where multiple sports fields or courts are provided, an accessible route is required to each field or area of sport activity.
In addressing the issue, you need to first place the school on notice of the requirements and that they are not ADA compliant. You should do this with a certified letter and return receipt. Ask that the issue be remedied and that in the mean time to reasonable accommodation be made for you.
If they do not acknowledge this and assist, you can file a complaint with the US Department of Justice. They can then address the issue on your behalf and on behalf of others similarly aggrieved.
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Best wishes going forward!