US Dams Near Any Address: data from the National Inventory of Dams (Radius Search, Hazard, Condition, Inspections)

Find every dam within a radius of a property, parcel, plant or portfolio location, nearest first, using National Inventory of Dams (NID) data: hazard potential, condition rating, last inspection date, emergency action plan, owner type, regulator, height, storage, river, year completed and operational status. Or pull all dams in one or more states with hazard and condition filters. No API key, no login. Published by BigSky Data Tools.

NOT FOR SAFETY-CRITICAL USE: data may be delayed or incomplete; not for life-safety, navigation or emergency decisions; use official USACE sources.

USACE NID caveat: USACE: "The data is for general information purposes ONLY and SHOULD NOT be used in technical applications such as, but not limited to: studies, designs or critical decision support." (https://water.usace.army.mil/help) Records include state-supplied fields. Owner fields are owner types (e.g. Private, State), never owner names. Every row carries a dataNotice field with this caveat.

Why use this dam data tool?

• 📍 Radius search, nearest first: every row has distanceMiles from your point.
• ⚠️ Risk fields in one row: hazardPotential (High / Significant / Low), conditionAssessment (Satisfactory, Fair, Poor, Unsatisfactory), lastInspectionDate, eapLastRevDate, operationalStatus.
• 🔎 Filters: states, hazard, condition, dam name, built in or before a year, minimum height.
• 🏗️ Physical specs: height, length, storage (acre-feet), surface area, drainage area, spillway, dam type.
• 🔗 Link back to the NID page for each dam (sourceUrl).
• 🚩 Ready-made riskFlags: high-hazard, poor-or-unsatisfactory-condition, high-hazard-no-eap (only when NID says an EAP was not prepared: eapStatus is no), inspection-overdue (last inspection older than its schedule plus one year), with inspectionAgeYears.

How it compares

In our Apify Store search on 2026-10-31 we did not find another Actor offering all of the features marked Yes below together; some alternatives offer individual features, as the "Typical alternatives" column shows. The Store may have changed since.

	This tool	Typical alternatives
Radius search from any point, nearest first	Yes, with distanceMiles	State-level filters
Inspection-overdue flag (schedule-aware)	Yes	Inspection-age flags (varies)
Physical specs (height, storage, spillway, drainage)	Yes	Varies
Link to each NID record	Yes	Varies

Who uses it

Property and flood insurers and underwriters, mortgage and CRE due-diligence teams, real-estate buyers and agents, engineering and dam-rehab firms selling to owners, municipal and hazard-mitigation planners (for planning and screening, not emergency response; see the safety notice above), ESG and infrastructure analysts, and journalists.

Input example

{ "latitude": "38.0293", "longitude": "-78.4767", "radiusMiles": 10 }

High-hazard dams in poor condition statewide: { "states": ["CA"], "hazardPotential": ["High"], "conditionAssessment": ["Poor", "Unsatisfactory"] }

Output example

{ "nidId": "VA003026", "damName": "Martha Jefferson Retention Basin Dam", "state": "Virginia", "countyState": "Albemarle, Virginia",
  "riverOrStream": "trib.  Rivanna River", "latitude": 38.0235, "longitude": -78.4467, "distanceMiles": 1.68,
  "hazardPotential": "Significant", "conditionAssessment": "Satisfactory", "conditionAssessDate": "2020-06-26",
  "lastInspectionDate": "2020-06-26", "inspectionFrequencyYears": 3, "eapLastRevDate": "2014-04-01",
  "primaryOwnerType": "Private", "regulatoryAgency": "Virginia Department of Conservation and Recreation",
  "primaryPurpose": "Flood Risk Reduction", "damType": "Earth", "heightFt": 36, "storageAcreFt": 29.4,
  "operationalStatus": "Under Investigation, Planning, Permitting, or Design for Remediation", "dataUpdated": "2022-12-04",
  "source": "National Inventory of Dams (U.S. Army Corps of Engineers)",
  "sourceUrl": "https://nid.sec.usace.army.mil/#/dams/system/VA003026/summary" }

Export to JSON, CSV, Excel or XML, or use the Apify API, Make, Zapier or n8n.

Pricing

$7 per 1,000 results ($0.007 per result) plus a $0.01 start fee per run. Pay per result: you pay for each dam saved, plus a small start fee. A 10-mile radius usually returns a few dozen to a hundred dams. Use maxResults to cap spend. Free-plan users can try it within their monthly platform credit. Apify's per-run maximum charge setting also limits results: for example, a $4.44 limit allows about 632 rows. Raise it in the run options for a full pull.

FAQ

Where does the data come from? From the public National Inventory of Dams web service published by the U.S. Army Corps of Engineers, compiled from state and federal dam-safety agencies. Source data are works of the U.S. federal government (U.S. Army Corps of Engineers) and generally not subject to U.S. copyright (17 U.S.C. 105). This is not a license or warranty; third-party or foreign rights may apply. Some records are supplied by states and may not be federal works. You are responsible for how you use the data. Why are some fields empty? Fields such as condition, inspection dates, year completed or EAP status are often not in the public NID, either because they were not reported or because they are not released publicly; NID does not say which. Empty means unknown, not "safe". Every row has notReportedNote, which lists each empty field with its reason, e.g. lastInspectionDate: not in the public NID (not reported, or not released publicly); distanceMiles: not applicable: no search center given. It is null only when no field is empty. What does eapStatus mean? yes, no or not required as reported to NID, or not reported when the public NID has no value (most dams). "Not reported" does not mean the dam has no Emergency Action Plan, so the high-hazard-no-eap flag is only set when eapStatus is no. As of 2026-11-01, the public NID has 0 dams with a No EAP answer (only Yes or Not Required), so this flag currently never fires. Is a "High" hazard dam unsafe? No. Hazard potential describes the consequences if a dam failed, not its condition. Use conditionAssessment for condition. Is this tool run by the data agency? No. BigSky Data Tools is independent and not affiliated with or endorsed by the U.S. Army Corps of Engineers or any dam-safety agency. Do not use it for emergency decisions.

Is the data guaranteed? No. The tool and data are provided as is, without warranty of accuracy, completeness or timeliness, and values can differ from the source agency's official products.

Changelog

• 2026-11-01: Breaking for riskFlags consumers: the riskFlags value high-hazard-no-eap-on-record was renamed to high-hazard-no-eap and is now set only when eapStatus is no (previously it fired for any high-hazard dam whose EAP was not "Yes", including not reported). Added eapStatus and notReportedNote.