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Updated on 09/02/2020

The Weldon Spring Site Interpretive Center remains closed to the public. During this unprecedented COVID-19 crisis, the health and safety of our employees and communities is our highest concern. To assure social distancing and comply with direction that non-essential activities be limited, the indoor areas of our centers will remain closed until further notice. We will continue to update our communications, if anything changes in the status for our interpretive center, and we look forward to the time when we can safely welcome our visitors back inside. In the meantime, we welcome you to enjoy the available outdoor spaces and trails. 

At the Weldon Spring Site, we welcome you to enjoy hiking or biking the Hamburg Trail, part of the Busch-Weldon Greenspace trail system around the site. The disposal cell is also open for a hike to the top to take in the panoramic views of St. Charles County.

We ask that guests follow the updated guidance related to social distancing, provided by the Missouri Department of Health and Senior Services and St. Charles County.

Stay safe!
Weldon Spring Site Interpretive Center

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The interpretive center is free and features an exhibit hall and two classrooms. Walk-in visitors are welcome during normal public hours. Scheduled educational programs occur throughout the year and tours are available upon request.

The 41-acre disposal cell is open to the public during daylight hours via a staircase and crushed gravel walkway. A viewing platform allows a panoramic view of St. Charles County and surrounding Howell Prairie.

A native plant garden with paths and benches welcomes visitors to the site. The 150-acre planted Howell Prairie features a wide variety of plants and wildlife and may be viewed from several trails and the disposal cell. 

The site serves as a trailhead to the multi-use 6-mile Hamburg Trail with connections to Missouri Department of Conservation trail systems, the Great Rivers Greenway trail network, and the historic Katy Trail State Park trail that stretches across the state along the Missouri River.

Busch-Weldon Greenspace Map

Hours of Operation

Interpretive Center

April 1 – October 31

  • Monday through Friday: 9:00 a.m. to 5:00 p.m.
  • Saturday: 10:00 a.m. to 4:00 p.m.
  • Sunday: 12:00 p.m. to 4:00 p.m.

November 1 – March 31

  • Monday through Friday: 9:00 a.m. to 5:00 p.m.
  • Saturday: 10:00 a.m. to 2:00 p.m.
  • Sunday: 12:00 p.m. to 4:00 p.m.

Weldon Spring Site

  • Monday through Sunday: The site is open during daylight hours.

Closed on federal holidays.

Group tours available seven days a week upon request.

Driving Directions

The Weldon Spring Site Interpretive Center is located in southwestern St. Charles County, Missouri, approximately 30 miles west of St. Louis. It is located on Missouri State Route 94, 2 miles south of the Route 94 and U.S. Highway 40/61 junction.

Weldon Spring Driving Map
Educational and Outreach Program Request

The Weldon Spring Site is one of many legacy sites across the nation that played a critical role during World War II and in America’s nuclear history. STEM and historical programs related to the site, advancements in technology, nuclear science, groundwater, remedial environmental action, and prairie ecology are provided by Certified Interpretive Guides.  Programs are provided free of charge to teachers, students, and groups. The Weldon Spring Site Interpretive Center is committed to supporting regional STEM education efforts and aligning to state and national education standards for pre-K through collegiate students.

Requests for on-site field experiences and limited off-site school programs must be made well in advance.

Registration for this school year is open!

School Year 2019-2020 and Summer 2020 Field Trips and Outreach Programs Booklet

To schedule your program, complete the Field Trip and Outreach Program Request.

Meeting Room Use and Hosting Site Events

As an additional free service to the community, the Weldon Spring Site Interpretive Center may grant permission for groups to use meeting room space during the day or evenings or host events on-site at no charge. Such requests require a special use permission process. Please read through the Special Use Permission Policy prior to completing the Special Use Permission Request form. For questions concerning the process or accepted activities, please contact the Interpretive Center:


In consideration of federal property and the safety of visitors, please understand the following:

  • Video surveillance is conducted 24/7.
  • Authorization is required for any organized group activity.
  • Pets must be leashed at all times and are not permitted inside facilities (except trained service animals).
  • Gas- and battery-powered mobility devices are not allowed on trails or grounds (allowances made for disability requirements).


  • Alcohol
  • Illegal drugs
  • Campfires
  • Firearms
  • Hunting
  • Hot air balloons
  • Off-road access
  • Digging/cutting/removing
  • Overnight overflow parking
  • Remote-controlled items
  • Unmanned aerial systems

Violators will be prosecuted in accordance with Title 18 of the United States Code.

For more site information, or to report a site-related problem, call (636) 300-2612 during business hours.

Prohibited Activities

By authority of Title 41 Code of Federal Regulations (CFR) Part 102-74, packages, briefcases, and other containers in the immediate possession of visitors, employees or other persons arriving on, working at, visiting, or departing from Federal property may be inspected. Persons in and on property must at all times comply with official signs of a prohibitory, regulatory, or directory nature. All persons entering in or on this property are prohibited from the following:

(A) Loitering and exhibiting disorderly conduct

(B) Improperly disposing of rubbish, willfully destroying or damaging property, stealing property, creating hazards, throwing articles from or at a building, or climbing upon any part of the building

(C) Gambling

(D) Being under the influence of any drug or alcohol other than prescription medication

(E) Operating a motor vehicle on the property while under the influence of alcohol or drugs

(F) Soliciting, except: funds authorized by 5 CFR Part 950; by employees on authorized bulletin boards; labor organizations authorized by the Civil Reform Act of 1978

(G) Distributing free samples of tobacco products, as mandated by Section 636 of Public Law 104-52

(H) Posting, affixing or distributing materials, such as pamphlets, handbills, or flyers, except as authorized in 41 CFR Part 102-74.410, or when these displays are conducted as part of authorized government activities or by official permit

(I) Photographs of workspace for commercial or non-commercial purposes without permission

(J) Animals, other than authorized service animals

(K) Blocking entrances, driveways, walks, loading platforms, or fire hydrants

(L) Parking without authority, parking in unauthorized locations or in locations reserved for other persons, or parking contrary to the direction of posted signs

(M) Carrying or possessing explosives, or items intended to be used to fabricate an explosive or incendiary device, either openly or concealed, except for official purposes

(N) The possession of firearms or other dangerous weapons by all persons not specifically authorized by 18 United States Code 930. Violators will be subject to fine and/or imprisonment for periods up to five (5) years

A person found guilty of violating any rule or regulation in this subpart while on any property shall be fined under Title 18 United States Code, imprisoned for not more than 30 days, or both.

Contact Us

Weldon Spring Site Interpretive Center
7295 Highway 94 South, St. Charles, MO 63304
(636) 300–2601