Western Connecticut Planning RegionConnecticut
New Canaan, Connecticut
1 high-hazard dam is rated in poor or unsatisfactory condition. None of its 23 inventoried bridges is rated poor.
- Live · as of Sep 11, 2026
- 9 public sources · method
- ← All towns
Bridges rated poor
0
of 23 inventoried
Poor high-hazard dams
1
National Inventory of Dams
01 · Dams & disasters
1 high-hazard dam needs work
| Dam | Condition | Built |
|---|---|---|
| Grupes Reservoir DamSilvermine River | Poor | 1871 |
High hazard potential means failure would probably cost lives — it rates the consequences, not the dam’s condition.
02 · Bridges
None of New Canaan's 23 bridges is rated poor
Every highway bridge and large culvert in the 2025 National Bridge Inventory that stands inside New Canaan. Median age 69 years.
35% good, 0% poor
FHWA good / fair / poor rating — the lowest of deck, superstructure, substructure or culvert.
- Good8 · 35%
- Fair15 · 65%
- Poor0 · 0%
Structures by decade built
n = 23 structuresSource: FHWA National Bridge Inventory 2025
▸ Show the numbers▾ Hide the numbers
| Built | Structures |
|---|---|
| 1930s | 7 |
| 1950s | 7 |
| 1960s | 2 |
| 1980s | 2 |
| 1990s | 2 |
| 2010s | 3 |
03 · Next door
New Canaan and the 4 towns that border it
A dash means no data for that layer, not zero.
| Town | Poor bridges |
|---|---|
| New Canaan, CT | 0 / 23 |
| Norwalk, CT | 3 / 76 |
| Stamford, CT | 4 / 59 |
| Wilton, CT | 0 / 24 |
| Darien, CT | 2 / 22 |
Where these numbers come from
Method, sources & caveats
New Canaan is the Census county subdivision 0919050580 (Western Connecticut Planning Region). 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.