March 2014 - Please allow one business day to receive new account information and/or reset password notification. If no email notification has been received within one business day of the request, please contact the NID data team at

May 2013 – The 2013 National Inventory of Dams database is now available! From August 2012 to February 2013, information was collected from the states and federal agencies that regulate dams in the United States. The NID web site is now referencing the 2013 database. All charts, queries and maps reflect the new 2013 information.

December 2012 - All NID account usernames and passwords have changed to be compliant with recent security policy changes. All NID account usernames were changed to be the same as the e-mail address registered with the user account. All registered users should have received an automatic email notification with their new, temporary login information. You must log into the NID site using your e-mail address and the new password. When logging into the site with your new password for the first time, it is highly recommended that you copy/paste your password from the email you received rather than manually typing the password. Please remember: your password is case sensitive even though your username is not.

December 2012 - Additionally, a new "Forgot Password" functionality has been added to the site, allowing users who have forgotten their passwords to immediately request a password reset and receive an e-mail containing their new password. Again, the new password will be randomly generated to conform to the latest security settings. The new "Forgot Password" functionality may be accessed either by clicking the Forgot Password tab (above) or by clicking here.

If you have any questions or concerns regarding your account, please contact the NID Data Team at:
Welcome to the National Inventory of Dams Web Site. To query the 2013 NID database, you must request a username and password. Non-government users can query the database using the interactive report and map functions but cannot directly download any data from this site. All questions can be directed to the NID Data Team at

Congress first authorized the US Army Corps of Engineers to inventory dams in the United States with the National Dam Inspection Act (Public Law 92-367) of 1972. The NID was first published in 1975, with a few updates as resources permitted over the next ten years. The Water Resources Development Act of 1986 (P.L. 99-662) authorized the Corps to maintain and periodically publish an updated NID, with re-authorization and a dedicated funding source provided under the Water Resources Development Act of 1996 (P.L. 104-3). The Corps also began close collaboration with the Federal Emergency Management Agency (FEMA) and state regulatory offices to obtain more accurate and complete information. The National Dam Safety and Security Act of 2002 (P.L. 107-310) reauthorized the National Dam Safety Program and included the maintenance and update of the NID by the Corps of Engineers. The most recent Dam Safety Act of 2006 reauthorized the maintenance and update of the NID.

The NID consists of dams meeting at least one of the following criteria;
1) High hazard classification - loss of one human life is likely if the dam fails,
2) Significant hazard classification - possible loss of human life and likely significant property or environmental destruction,
3) Equal or exceed 25 feet in height and exceed 15 acre-feet in storage,
4) Equal or exceed 50 acre-feet storage and exceed 6 feet in height.

The goal of the NID is to include all dams in the U.S. that meet these criteria, yet in reality, is limited to information that can be gathered and properly interpreted with the given funding. The Inventory initially consisted of approximately 45,000 dams, which were gathered from extensive record searches and some feature extraction from aerial imagery. Since continued and methodical updates have been conducted, data collection has been focused on the most reliable data sources, which are the many federal and state government dam construction and regulation offices. In most cases, dams within the NID criteria are regulated (construction permit, inspection, and/or enforcement) by federal or state agencies, who have basic information on the dams within their jurisdiction. Therein lies the biggest challenge, and most of the effort to maintain the NID; periodic collection of dam characteristics from 49 states (Alabama currently has no dam safety legislation or formal dam safety program), Puerto Rico, and 18 federal of