Earth Support Corp

Grafton CountyNew Hampshire

Woodstock, New Hampshire

5 of its 31 inventoried bridges are rated poor (16%, against 8% statewide). Bedrock sits a median 40 ft down across 89 logs, deeper than the New Hampshire median of 20 ft.

Median depth to bedrock

40 ft

middle half 19–86 ft · 89 logs

Bridges rated poor

5

of 31 inventoried

FEMA repair $, Grafton County

$53.0M

federal share since 2010 · county-wide

01 · Bridges

5 of 31 bridges are rated poor — above the New Hampshire rate of 8%

Every highway bridge and large culvert in the 2025 National Bridge Inventory that stands inside Woodstock. Median age 54 years; 1 posted for weight.

35% good, 16% poor

FHWA good / fair / poor rating — the lowest of deck, superstructure, substructure or culvert.
  • Good11 · 35%
  • Fair15 · 48%
  • Poor5 · 16%

Structures by decade built

05101520251930s1940s1950s1960s1970s1990s
n = 31 structuresSource: FHWA National Bridge Inventory 2025
▸ Show the numbers
BuiltStructures
1930s3
1940s2
1950s1
1960s1
1970s22
1990s2

The poor-rated bridges

Bridges rated poor in Woodstock
CarriesOverBuiltDaily traffic
NH112 KANCAMAGUSPEMIGEWASSET RIVER19336,210
US 3LOST RIVER19312,784
NH175postedPEMIGEWASSET RIVER1939674
NFSR XH22HUBBARD BROOK196150
FDR 29WALKER BROOK197550
Every poor bridge in New England

02 · Ground

Rock turns up a median 40 ft down

From 89 depth-to-rock records inside Woodstock (NH DES well inventory). Logs cluster where people drill wells and bore for roads, so treat this as the town’s pattern, not a site answer.

Half of Woodstock's logs reach rock between 19 and 86 ft

Depth to bedrock: 10th–90th percentile whisker, middle-half box, median tick; dashed line = New Hampshire median.
median 40 ft
NH 20 ft
050100 ft
0510152025300–5 ft5–10 ft10–20 ft20–50 ft50–100 ft100+ ft
n = 89 logsSource: NH DES well inventory
▸ Show the numbers
Depth to rock (ft)Logs
0–50
5–109
10–2014
20–5029
50–10024
100+13

Rock within 10 ft

14%

of logs (31% across New Hampshire). 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. 40% of logs here go past 50 ft.
Bedrock & soils across New England

03 · Dams & disasters

Grafton County has drawn $53.0M in federal disaster repair since 2010

FEMA Public Assistance is reported by county, so the figure below is Grafton County-wide context, not a Woodstock number.

FEMA Public Assistance, Grafton County

$53.0M

Federal share obligated across 611 projects in 16 declared disasters since 2010. The largest category is roads & bridges (41%); roads & bridges took $21.5M.
Dams, disasters & moving ground

04 · Next door

Woodstock and the 6 towns that border it

A dash means no data for that layer, not zero.
Woodstock compared with neighbouring towns
TownPoor bridgesRock depth
Woodstock, NH5 / 3140 ft
Lincoln, NH0 / 3140 ft
Thornton, NH1 / 2142 ft
Warren, NH1 / 1520 ft
Benton, NH1 / 1520 ft
Easton, NH1 / 849 ft
Ellsworth, NH0 / 722 ft

Where these numbers come from

Method, sources & caveats

Woodstock is the Census county subdivision 3300987060 (Grafton 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

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.

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