Providence CountyRhode Island
Johnston, Rhode Island
4 high-hazard dams are rated in poor or unsatisfactory condition. 4 of its 22 inventoried bridges are rated poor (18%, against 14% statewide).
- Live · as of Sep 11, 2026
- 9 public sources · method
- ← All towns
Bridges rated poor
4
of 22 inventoried · 1 closed
Poor high-hazard dams
4
National Inventory of Dams
FEMA repair $, Providence County
$626M
federal share since 2010 · county-wide
01 · Dams & disasters
4 high-hazard dams need work
FEMA Public Assistance is reported by county, so the figure below is Providence County-wide context, not a Johnston number.
| Dam | Condition | Built |
|---|---|---|
| Oak Swamp ReservoirDry Brook | Poor | 1865 |
| Simmons Upper ReservoirCedar Swamp Brook | Poor | 1865 |
| Almy ReservoirDry Brook | Poor | 1865 |
| Hughesdale Pond UpperDry Brook | Poor | — |
High hazard potential means failure would probably cost lives — it rates the consequences, not the dam’s condition.
FEMA Public Assistance, Providence County
$626M
Federal share obligated across 997 projects in 7 declared disasters since 2010. The largest category is emergency protective measures (95%); roads & bridges took $2.8M.
02 · Bridges
4 of 22 bridges are rated poor — above the Rhode Island rate of 14%
Every highway bridge and large culvert in the 2025 National Bridge Inventory that stands inside Johnston. Median age 55 years; 2 posted for weight; 1 closed.
45% good, 18% poor
FHWA good / fair / poor rating — the lowest of deck, superstructure, substructure or culvert.
- Good10 · 45%
- Fair8 · 36%
- Poor4 · 18%
Structures by decade built
n = 22 structuresSource: FHWA National Bridge Inventory 2025
▸ Show the numbers▾ Hide the numbers
| Built | Structures |
|---|---|
| pre-1910 | 2 |
| 1910s | 1 |
| 1940s | 1 |
| 1960s | 6 |
| 1970s | 2 |
| 2010s | 3 |
| 2020s | 7 |
The poor-rated bridges
| Carries | Over | Built | Daily traffic |
|---|---|---|---|
| US 6 EB & WBposted | US 6A HARTFORD AV RAMP | 1969 | 53,619 |
| US 6A HARTFRD AV | US 6 | 1969 | 7,504 |
| GREYSTONE AVclosed | WOONASQUATUCKET RIVER | 1949 | 2,965 |
| RI 14 PLNFLD STposted | POCASSET RIVER | 1897 | 11 |
03 · Next door
Johnston and the 6 towns that border it
A dash means no data for that layer, not zero.
| Town | Poor bridges |
|---|---|
| Johnston, RI | 4 / 22 |
| Providence, RI | 19 / 145 |
| Cranston, RI | 11 / 63 |
| Smithfield, RI | 1 / 25 |
| Scituate, RI | 0 / 10 |
| North Providence, RI | 0 / 4 |
| Glocester, RI | 0 / 3 |
Where these numbers come from
Method, sources & caveats
Johnston is the Census county subdivision 4400737720 (Providence 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.