Bald eagles are thriving across the United States. Their population recovery is one of conservation's greatest success stories - but for developers and environmental consultants, a nesting pair near a project site can bring construction to a halt.
Even though the bald eagle was delisted from the ESA in 2007, it remains protected under two powerful federal laws. Understanding the buffer requirements, permit process, and seasonal restrictions is essential for any project near eagle habitat.
The Laws That Protect Bald Eagles
Bald and Golden Eagle Protection Act (BGEPA)
The BGEPA (16 U.S.C. 668-668d) prohibits anyone from taking, possessing, selling, or transporting bald or golden eagles, including their parts, nests, or eggs. "Take" under BGEPA includes disturb, which is defined as any activity that causes:
- Injury to an eagle
- A decrease in productivity by substantially interfering with normal breeding, feeding, or sheltering behaviour
- Nest abandonment
Penalties are severe: up to $100,000 and one year imprisonment for a first offence. Second offences can result in $250,000 fines and two years imprisonment.
Migratory Bird Treaty Act (MBTA)
The MBTA (16 U.S.C. 703-712) provides additional protection for bald eagles as a migratory bird species. The MBTA prohibits the take of any migratory bird, including their nests and eggs.
Why Not ESA?
The bald eagle was removed from the ESA threatened species list in 2007. This means Section 7 consultation with USFWS is no longer required specifically for bald eagles. However, BGEPA provides equivalent or stronger protection in practice, and the USFWS National Bald Eagle Management Guidelines still apply.
The 660-Foot Buffer Rule
The USFWS National Bald Eagle Management Guidelines (2007) establish buffer distances to avoid disturbing nesting eagles:
660 feet (200 metres) is the standard buffer distance from an active or alternate nest for most activities. Within this buffer:
- No new construction or development
- No heavy equipment operation
- No blasting or loud noise
- No tree removal that would affect nest visibility or flight paths
330 feet (100 metres) may be acceptable for some low-impact activities if the nest is visually screened by vegetation or topography, and the activity is temporary.
Important clarification: These are guidelines, not absolute legal requirements. The actual buffer needed depends on the specific circumstances - species tolerance, topography, vegetation screening, type of activity, and duration. A nest in an urban area where eagles are habituated to human activity may tolerate closer approach than a nest in a remote wilderness setting.
However, violating these guidelines significantly increases the risk of a BGEPA enforcement action if eagle disturbance occurs. Most consultants and agencies treat the 660ft buffer as the default standard.
Nesting Season
Bald eagle nesting season varies by region:
Southern states (Florida, Gulf Coast): October - May. Eagles in the south nest earlier, with egg-laying as early as October and fledging by April-May.
Northern states (Great Lakes, New England): January - August. Northern eagles nest later, with egg-laying in February-March and fledging by July-August.
Mid-Atlantic and Central states: December - July. Intermediate timing.
During nesting season, the 660ft buffer is strictly enforced. Outside nesting season, some activities may be permissible closer to the nest, but the nest tree itself is protected year-round.
Alternate nests: Eagles often maintain multiple nests within their territory and may switch between them from year to year. All nests - active and alternate - are protected under BGEPA. Destroying an alternate nest without a permit is a violation even if it's not being used that year.
When You Find an Eagle Nest Near Your Project
Step 1: Confirm Nest Status
Have a qualified biologist conduct a nest survey to determine:
- Is the nest active (currently being used for breeding)?
- Is it an alternate nest (maintained but not active this year)?
- Is it abandoned (deteriorated, not maintained)?
Nest status affects your options. Active nests get full protection. Alternate nests are still protected but some activities may be permitted at closer distances outside nesting season. Truly abandoned nests (which are rare - eagles maintain nests for decades) may have fewer restrictions.
Step 2: Measure the Buffer
Using GIS or field measurement, determine the distance from the nest to your project footprint. If the project is entirely outside 660ft, you can likely proceed with standard precautions during the non-nesting season.
If the project encroaches within 660ft, you need to evaluate whether a BGEPA permit is required.
Step 3: Evaluate Permit Need
You may need a BGEPA Eagle Disturb Permit if your project:
- Is within 660ft of an active or alternate nest during nesting season
- Involves activities that could cause visual or noise disturbance to nesting eagles
- Requires removal of trees that provide nest screening
- Could alter the landscape in ways that affect eagle behaviour
Step 4: Apply for Permit (If Needed)
BGEPA Disturb Permits are issued by the USFWS Migratory Bird Permit Office. The application requires:
- Detailed project description and timeline
- Map showing nest location relative to project
- Assessment of potential disturbance
- Proposed avoidance, minimisation, and mitigation measures
- Monitoring plan
Processing time is typically 3-6 months, so apply early.
Nest Removal
Removing or relocating a bald eagle nest requires a separate BGEPA Eagle Nest Take Permit. These are rarely granted and only under specific circumstances:
- The nest poses a direct safety hazard (e.g., on a power line)
- The nest must be removed for a necessary project and no practicable alternatives exist
- The nest is inactive and removal occurs outside nesting season
Nest removal permits require compensatory mitigation, which may include habitat enhancement, installation of nesting platforms, or other measures to support eagle populations.
Practical Tips for Consultants
Survey for nests early. Eagle nests are large (5-6 feet in diameter, up to 2,000 pounds) and visible from a distance, especially in winter when deciduous trees have dropped their leaves. A winter aerial survey or driving survey can identify nests before project design is finalised.
Check EcoCheck first. EcoCheck returns bald eagle occurrence records from GBIF within your search buffer. If there are recent eagle records near your site, a nest survey is almost certainly warranted. No eagle records doesn't mean no eagles - they're widely distributed - but records help prioritise survey effort.
Buffer from project design, not project boundary. The 660ft buffer applies from the nest to the nearest project activity, not the property line. If your project footprint is on the far side of a large parcel from the nest, the buffer may not be an issue even if the nest is within 660ft of the property boundary.
Document habituation. If eagles near your site are already habituated to human activity (e.g., nesting near an existing road, building, or public area), document this. It supports an argument that your project activities are unlikely to cause additional disturbance beyond baseline conditions.
Monitor during construction. Even with a permit, monitoring during construction is essential. A qualified biologist should observe eagle behaviour during critical periods. If eagles show signs of disturbance (agitation, nest abandonment), work may need to be modified or temporarily halted.
Remember alternate nests. Don't focus only on the active nest. Survey the surrounding area for alternate nests, which are also protected. Eagles may switch nests between years, and destroying an alternate nest can trigger a BGEPA violation.
What EcoCheck Shows You
EcoCheck searches GBIF for bald eagle occurrence records near your project location. The results show:
- Number of eagle records within your search buffer
- Year range of observations
- Data source and licensing
- Individual record locations plotted on the map
Eagle records indicate the species is active in the area and a nest survey should be conducted. The absence of records doesn't confirm absence of eagles, but it helps inform the level of survey effort needed.
For corridor projects (roads, pipelines, transmission lines), the Corridor Search feature checks multiple points along your route, identifying which sections have the highest concentration of eagle records and where nest surveys should be focused.
Patrick O'Connor is a Freelance Ecologist at Kinterra Consulting and the developer of EcoCheck - an instant ecological desktop assessment tool for any location. Try it free at ecocheck.co (UK) or ecocheckus.com (US).