Androscoggin CountyMaine
Auburn, Maine
2 high-hazard dams are rated in poor or unsatisfactory condition. Bedrock sits a median 18 ft down across 668 logs, deeper than the Maine median of 15 ft.
- Live · as of Sep 11, 2026
- 9 public sources · method
- ← All towns
Median depth to bedrock
18 ft
middle half 8–47 ft · 668 logs
Bridges rated poor
2
of 32 inventoried
Poor high-hazard dams
2
National Inventory of Dams
Mapped landslides
1
USGS inventory points
01 · Dams & disasters
2 high-hazard dams need work
FEMA Public Assistance is reported by county, so the figure below is Androscoggin County-wide context, not a Auburn number.
| Dam | Condition | Built |
|---|---|---|
| Lake AuburnBobbin Mill Brook | Unsatisfactory | 1946 |
| North AuburnLake Auburn | Unsatisfactory | 1964 |
High hazard potential means failure would probably cost lives — it rates the consequences, not the dam’s condition.
FEMA Public Assistance, Androscoggin County
$27.3M
Federal share obligated across 155 projects in 4 declared disasters since 2010. The largest category is emergency protective measures (88%); roads & bridges took $956K.
02 · Ground
Rock turns up a median 18 ft down
From 668 depth-to-rock records inside Auburn (Maine Geological Survey wells database). Logs cluster where people drill wells and bore for roads, so treat this as the town’s pattern, not a site answer.
Half of Auburn's logs reach rock between 8 and 47 ft
Depth to bedrock: 10th–90th percentile whisker, middle-half box, median tick; dashed line = Maine median.
median 18 ftME 15 ft
0255075 ft
n = 668 logsSource: Maine Geological Survey wells database
▸ Show the numbers▾ Hide the numbers
| Depth to rock (ft) | Logs |
|---|---|
| 0–5 | 69 |
| 5–10 | 142 |
| 10–20 | 142 |
| 20–50 | 154 |
| 50–100 | 111 |
| 100+ | 50 |
Rock within 10 ft
36%
of logs (40% across Maine). Shallow rock means ledge in excavations, refusal for driven piles and rock anchors rather than soil nails; deep ground means taller shoring and more groundwater. 23% of logs here go past 50 ft.
Mapped landslides
1
1 spread/flow. Inventory points from the USGS U.S. Landslide Inventory; many are prehistoric slides mapped from lidar.
03 · Bridges
2 of 32 bridges are rated poor — below the Maine rate of 15%
Every highway bridge and large culvert in the 2025 National Bridge Inventory that stands inside Auburn. Median age 69 years.
31% good, 6% poor
FHWA good / fair / poor rating — the lowest of deck, superstructure, substructure or culvert.
- Good10 · 31%
- Fair20 · 63%
- Poor2 · 6%
Structures by decade built
n = 32 structuresSource: FHWA National Bridge Inventory 2025
▸ Show the numbers▾ Hide the numbers
| Built | Structures |
|---|---|
| 1920s | 1 |
| 1930s | 2 |
| 1940s | 1 |
| 1950s | 13 |
| 1960s | 1 |
| 1970s | 2 |
| 1980s | 2 |
| 1990s | 1 |
| 2000s | 3 |
| 2010s | 5 |
| 2020s | 1 |
The poor-rated bridges
| Carries | Over | Built | Daily traffic |
|---|---|---|---|
| MAIN ST | PEDESTRIAN WALKWAY | 1975 | 19,242 |
| DANVILLE CORNER RD | MCRR | 1930 | 1,828 |
04 · Next door
Auburn and the 7 towns that border it
A dash means no data for that layer, not zero.
| Town | Poor bridges | Rock depth |
|---|---|---|
| Auburn, ME | 2 / 32 | 18 ft |
| Lewiston, ME | 4 / 40 | 16 ft |
| New Gloucester, ME | 0 / 15 | 20 ft |
| Turner, ME | 4 / 13 | 25 ft |
| Minot, ME | 0 / 8 | 15 ft |
| Poland, ME | 0 / 2 | 23 ft |
| Durham, ME | 0 / 1 | 21 ft |
| Greene, ME | 0 / 1 | 16 ft |
Where these numbers come from
Method, sources & caveats
Auburn is the Census county subdivision 2300102060 (Androscoggin County). Every record is placed here by its coordinates, not by the place name the source uses.
- Towns are Census county subdivisions: cities, towns, plantations, and Maine/New Hampshire unorganized territories and townships. Every record is placed in a town by its coordinates (point-in-polygon), not by the source's own place label — so a bridge in Roxbury counts for Boston and a well in 'North Waltham' counts for Waltham.
- Bridges: FHWA NBI 2025, highway structures ≥ 20 ft including large culverts. 'Poor' is FHWA's good/fair/poor rating (lowest of deck, superstructure, substructure or culvert ≤ 4). Percent-poor is shown only for towns with at least 5 structures.
- Depth to bedrock is the median of driller- and boring-reported depths in the town, shown only where at least 10 logs exist. Water-well logs over-sample rural lots and hilltops; one town median never describes a particular site.
- Bedrock depths use the same state databases and filters as the Bedrock & soils module (bedrock wells and borings that reached rock, 0 < depth ≤ 400 ft, exact re-filings dropped), but every log is placed in a town by its coordinates rather than the driller's town field, so town counts can differ slightly between the two pages. Connecticut and Rhode Island have no statewide public well-log database with depths.
- Dams: only high-hazard-potential dams whose latest condition assessment is Poor or Unsatisfactory are counted (live NID). Connecticut and Rhode Island assessments may lag.
- FEMA Public Assistance dollars are federal share obligated for disasters declared since 2010, reported by county — they are county context, not a town figure.
- Grant awards are Massachusetts only (EEA Dam & Seawall program, MVP Action grants, CZM Coastal Resilience). Other states' programs are not yet included.
- Ground-related permit counts cover only the municipal portals the pipeline reads (Boston, Cambridge, Somerville, Worcester, Framingham, Providence, Portsmouth, Hartford and a few others) — an absent count means 'not covered', not zero.
- Data as of
- Sep 11, 2026
- Generated
- Sep 11, 2026
- Records
- 367,748
- Refresh
- Live pull · weekly
- U.S. Census Bureau cartographic boundary files — county subdivisions (2024, 1:500k)Public domain
- FHWA National Bridge Inventory (2025 delimited files)Public domain
- USACE National Inventory of DamsPublic domainHigh-hazard dams rated Poor or Unsatisfactory (live NID).
- USGS U.S. Landslide InventoryPublic domain
- MassGIS / Massachusetts Geological Survey — Bedrock Data PointsPublic recordBorings and well logs that reached rock (MassDEP well drillers, USGS, MWRA, MassDOT…); seismic/HVSR and map-derived shallow-bedrock/outcrop points excluded.
- NH DES Water Well Inventory, Maine Geological Survey Wells Database, Vermont DEC well recordsPublic recordBedrock wells only; driller-reported depth to bedrock / overburden thickness.
- OpenFEMA Public Assistance Funded Projects Details (v2)Public domain
- MA EEA / CZM grant awards — Dam & Seawall, MVP Action, CZM Coastal ResiliencePublic record
- Municipal open-data permit portals (Boston, Cambridge, Somerville, Providence, Portsmouth, others)Public recordOnly permits flagged as ground-related (retaining walls, excavation, foundations) are counted.
Published by Earth Support Corp as a public resource. Regional statistics for planning and curiosity. They are not an engineering report, a bid recommendation or a statement about any particular site, firm or project. Spot an error? Tell us and we will correct it. Full method: methodology.