Penobscot CountyMaine
Bangor, Maine
Bedrock sits a median 15 ft down across 187 logs, close to the Maine median of 15 ft. 9 of its 33 inventoried bridges are rated poor (27%, against 15% statewide).
- Live · as of Sep 11, 2026
- 9 public sources · method
- ← All towns
Median depth to bedrock
15 ft
middle half 7–30 ft · 187 logs
Bridges rated poor
9
of 33 inventoried
FEMA repair $, Penobscot County
$84.9M
federal share since 2010 · county-wide
01 · Ground
Rock is close to the surface: 43% of logs hit it within 10 ft
From 187 depth-to-rock records inside Bangor (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 Bangor's logs reach rock between 7 and 30 ft
Depth to bedrock: 10th–90th percentile whisker, middle-half box, median tick; dashed line = Maine median.
median 15 ftME 15 ft
02040 ft
n = 187 logsSource: Maine Geological Survey wells database
▸ Show the numbers▾ Hide the numbers
| Depth to rock (ft) | Logs |
|---|---|
| 0–5 | 30 |
| 5–10 | 28 |
| 10–20 | 50 |
| 20–50 | 62 |
| 50–100 | 14 |
| 100+ | 3 |
Rock within 10 ft
43%
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. 8% of logs here go past 50 ft.
02 · Bridges
9 of 33 bridges are rated poor — above the Maine rate of 15%
Every highway bridge and large culvert in the 2025 National Bridge Inventory that stands inside Bangor. Median age 64 years.
15% good, 27% poor
FHWA good / fair / poor rating — the lowest of deck, superstructure, substructure or culvert.
- Good5 · 15%
- Fair19 · 58%
- Poor9 · 27%
Structures by decade built
n = 33 structuresSource: FHWA National Bridge Inventory 2025
▸ Show the numbers▾ Hide the numbers
| Built | Structures |
|---|---|
| 1920s | 1 |
| 1930s | 2 |
| 1940s | 1 |
| 1950s | 2 |
| 1960s | 15 |
| 1970s | 2 |
| 1980s | 2 |
| 1990s | 1 |
| 2000s | 3 |
| 2010s | 3 |
| 2020s | 1 |
The poor-rated bridges
| Carries | Over | Built | Daily traffic |
|---|---|---|---|
| I 95 | ROUTE 15 (BROADWAY) | 1960 | 25,340 |
| I 95 SB | STILLWATER AVENUE | 1960 | 25,150 |
| I 95 NB | STILLWATER AVENUE | 1960 | 25,120 |
| INDEPENDENT ST | KENDUSKEAG STREAM | 1929 | 11,561 |
| HOGAN RD | INTERSTATE 95 NB & SB | 1960 | 8,606 |
| STATE ST | KENDUSKEAG STREAM | 1976 | 8,231 |
| KENDUSKEAG AVENUE | INTERSTATE 95 NB & SB | 1960 | 3,020 |
| RAMP ON FROM US202 | INTERSTATE 395 | 1964 | 2,757 |
| CHASE RD | INTERSTATE 95 NB & SB | 1960 | 1,920 |
03 · Dams & disasters
Penobscot County has drawn $84.9M in federal disaster repair since 2010
FEMA Public Assistance is reported by county, so the figure below is Penobscot County-wide context, not a Bangor number.
FEMA Public Assistance, Penobscot County
$84.9M
Federal share obligated across 255 projects in 4 declared disasters since 2010. The largest category is emergency protective measures (91%); roads & bridges took $1.1M.
04 · Next door
Bangor and the 6 towns that border it
A dash means no data for that layer, not zero.
| Town | Poor bridges | Rock depth |
|---|---|---|
| Bangor, ME | 9 / 33 | 15 ft |
| Hampden, ME | 4 / 20 | 15 ft |
| Brewer, ME | 2 / 10 | 24 ft |
| Orono, ME | 3 / 6 | 17 ft |
| Hermon, ME | 0 / 5 | 14 ft |
| Veazie, ME | 0 / 1 | — |
| Glenburn, ME | — | 18 ft |
Where these numbers come from
Method, sources & caveats
Bangor is the Census county subdivision 2301902795 (Penobscot 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.