La Forteresse

Isère · CC Bièvre Isère · INSEE 38171

A school and somewhere to eat or drink, but no food shop.

Few services 30.2/100 · confidence: high· Better served than 73 % of the {n|commune|communes} of a similar size.

Identity

La Forteresse (INSEE 38171) is in Isère (38), part of CC Bièvre Isère. Population 338 (2023). ^[1]

INSEE density class: Rural à habitat dispersé (level 6). ^[2]

Data vintages: INSEE BPE 2025 · INSEE SIRENE 2026-09 · INSEE census (RP) 2023 · INSEE COG 2026 · INSEE density grid 2026.

Permanent link: https://vivantrural.com/en/fr/38171-la-forteresse

Vitality score

Vitality score 30.2/100 — Few services (model fr-v0.2).

Confidence: high.

Better served than 73 % of the 18,030 communes of a similar size.

Compare this with communes of a similar size. The score measures how well a place is served relative to its own size band, and larger communes score higher as a rule — so it reads meaningfully against another village, and misleadingly against a town.

Measured but not scored in this model: Market. See the methodology for why.

Component	Value (0–1)	Weight	Contribution
Daily food	0	25	0
Social	0.32	20	6.32
Education	0.63	10	6.32
Health	0	10	0
Public & culture	0	5	0
Population trend	0.85	10	8.47
Housing mix	0.91	5	4.56

Services

What is here, at a glance

Food 0 of 6

Eating out 1 of 1

Cafés and bars 0 of 1

Schools 1 of 3

Health 0 of 4

Public services 0 of 1

Culture 0 of 2

Sport 0 of 2

Everyday services 0 of 3

Lodging 0 of 2

One square per service type, shaded by how many: none, one, a few, five or more. A blank square means none was counted — the sources do not distinguish “none here” from “not counted”.

A school and somewhere to eat or drink, but no food shop. ^[3,4]

1 × Restaurant. ^[3,4]

1 × Primary school (élémentaire) (ECOLE PRIMAIRE PUBLIQUE). ^[3]

Not found in the commune: Bakery (boulangerie), Butcher (boucherie), Grocery (épicerie / supérette), Supermarket, Café / bar, Nursery school (maternelle), GP (médecin généraliste), Pharmacy, Post office / agence postale, Library. ^[3,4]

All 25 service types, with per-source counts

Type	Count	Names	Sources
Bakery (boulangerie)	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Butcher (boucherie)	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Grocery (épicerie / supérette)	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Supermarket	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Cheese shop (fromagerie)	0		INSEE SIRENE 0 [4]
Fishmonger	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Restaurant	1		INSEE BPE 1 / INSEE SIRENE 1 [3,4]
Café / bar	0		INSEE SIRENE 0 [4]
Nursery school (maternelle)	0		INSEE BPE 0 [3]
Primary school (élémentaire)	1	ECOLE PRIMAIRE PUBLIQUE	INSEE BPE 1 [3]
Collège	0		INSEE BPE 0 [3]
GP (médecin généraliste)	0		INSEE BPE 0 [3]
Pharmacy	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Nurse	0		INSEE BPE 0 [3]
Dentist	0		INSEE BPE 0 [3]
Post office / agence postale	0		INSEE BPE 0 [3]
Library	0		INSEE BPE 0 [3]
Cinema	0		INSEE BPE 0 [3]
Gym / sports hall	0		INSEE BPE 0 [3]
Swimming pool	0		INSEE BPE 0 [3]
Bank	0		INSEE BPE 0 [3]
Hairdresser	0		INSEE SIRENE 1 / INSEE BPE 0 [4]
Fuel station	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Hotel	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Campsite	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]

Market and village life

Market day: unknown — nothing found in the datasets or on the commune website.

Trajectory

1968: 262 2023: 338 axis from zero, so the slope compares with any other commune

Population 318 (2012) → 338 (2023): 6.3 % over 10 years. ^[5,1]

Population 251 (1990) → 338 (2023): 34.7 % over 30 years. ^[6,1]

Dwellings (2023): 158, of which 4.4 % second homes and 5.1 % vacant. ^[7]

Access and surroundings

Which way the everyday services lie

In the commune Primary school GP — 4.5 km SBakery — 4.7 km NEFood shop — 4.7 km NEPharmacy — 5.0 km N Straight-line, from the mairie, in the direction given. Services in the same town share a spoke. Distance is not travel time: a pass or an estuary can double it.

Bakery (Izeaux): 4.7 km to the north-east (straight line). ^[8]

Food shop (Izeaux): 4.7 km to the north-east (straight line). ^[8]

GP (Vatilieu): 4.5 km to the south (straight line). ^[9]

Pharmacy (Izeaux): 5 km to the north (straight line). ^[8]

Primary school (La Forteresse): 0.1 km to the east (straight line). ^[10]

Climate

Where this sits nationally

Days at or above 30 °C 10.3

Days at or below 0 °C 53.4

Muggy days a summer 0

Each track runs from the 5th to the 95th percentile of the 34,141 communes with that measurement; the tick is the median. A value beyond either end sits at the end and is marked ▸.

An average of 10 days a year at or above 30 °C and 53 days at or below 0 °C, over 23 complete years in 1995–2024. ^[11]

Measured at the SERRE-NERPOL weather station, 4 km away at 630 m; the village itself is at 535 m. ^[11]

The village sits 95 m below the station, so each day's reading was shifted by 6.06 °C per km of altitude before the days were counted. Expect the result to be within about 0.68 °C. ^[11]

Muggy days — a dew point at or above 18 °C — average 0 days a summer. ^[11]

Humidity measured at GRENOBLE-ST GEOIRS, 10.3 km away at 376 m, over 30 summers. ^[11]

That station sits 159 m below the village, so each day's humidity was shifted by 3.69 °C per km before the muggy days were counted. ^[11]

An average of 1,054 mm of rain a year, spread over 112 days — about 9.4 mm on a day it rains. ^[11]

Rainfall measured at SERRE-NERPOL, 4 km away at 630 m. Rainfall is not adjusted for altitude: unlike temperature it has no simple gradient to correct by. ^[11]

Uncertainties

No specific uncertainties flagged.

References

INSEE census (RP) 2023 — 38171/2023
INSEE density grid 2026
INSEE BPE 2025
INSEE SIRENE 2026-09
INSEE census (RP) 2023 — 38171/2012
INSEE census (RP) 2023 — 38171/1990
INSEE census (RP) 2023 — 38171/logement/2023
INSEE BPE 2025 — 38194
INSEE BPE 2025 — 38526
INSEE BPE 2025 — 38171
Météo-France daily climatology 1995-2024

Villages like this one

Matched on size, density, second homes and which everyday shops and services are present — not on the score, so a village of the same kind that is doing better or worse shows up rather than being hidden.

Commune	Dept	Distance	Population	Score	Band	Climate vs here
Coinches	88	351 km N	346	26.1	Few services	Warmer summers and colder winters.Summers feel about as humid.summer 79 % · winter 58 % · humidity 93 %
Gouy-en-Artois	62	589 km N	327	24.4	Few services	Similar summers, milder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 86 %
Versigny	60	474 km NW	349	26.5	Few services	Much the same temperatures.Summers feel about as humid.summer 95 % · winter 85 % · humidity 93 %
Morand	37	420 km NW	351	31.4	Few services	Warmer summers, similar winters.Summers feel about as humid.summer 79 % · winter 86 % · humidity 93 %
Arsague	40	528 km W	348	27.6	Few services	Warmer summers and milder winters.summer 41 % · winter 78 %
Cernusson	49	499 km NW	329	28.8	Few services	Warmer summers and milder winters.Summers feel about as humid.summer 85 % · winter 73 % · humidity 86 %

Order by distance instead

Commune	Dept	Distance	Population	Score	Band	Climate vs here
Coinches	88	351 km N	346	26.1	Few services	Warmer summers and colder winters.Summers feel about as humid.summer 79 % · winter 58 % · humidity 93 %
Morand	37	420 km NW	351	31.4	Few services	Warmer summers, similar winters.Summers feel about as humid.summer 79 % · winter 86 % · humidity 93 %
Versigny	60	474 km NW	349	26.5	Few services	Much the same temperatures.Summers feel about as humid.summer 95 % · winter 85 % · humidity 93 %
Cernusson	49	499 km NW	329	28.8	Few services	Warmer summers and milder winters.Summers feel about as humid.summer 85 % · winter 73 % · humidity 86 %
Arsague	40	528 km W	348	27.6	Few services	Warmer summers and milder winters.summer 41 % · winter 78 %
Gouy-en-Artois	62	589 km N	327	24.4	Few services	Similar summers, milder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 86 %

Sort and compare these on the full list →

…and in much the same climate

The same match on size and services, narrowed to communes whose summers, winters and summer humidity are all close to La Forteresse's. All three are required, so this section is absent for the 11.8 % of communes with no humidity station near enough to measure: two temperature axes alone cannot tell a muggy coast from a dry one.

Commune	Dept	Distance	Population	Score	Band	Climate vs here
Versigny	60	474 km NW	349	26.5	Few services	Much the same temperatures.Summers feel about as humid.summer 95 % · winter 85 % · humidity 93 %
La Vallée-au-Blé	02	522 km N	355	25.7	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 93 % · humidity 93 %
Lamotte-Buleux	80	606 km NW	328	28.4	Few services	Much the same temperatures.Summers feel about as humid.summer 92 % · winter 95 % · humidity 93 %
Morchain	80	535 km N	362	30.1	Few services	Much the same temperatures.Summers feel about as humid.summer 95 % · winter 86 % · humidity 93 %
Morcourt	80	551 km N	327	30.6	Few services	Much the same temperatures.Summers feel about as humid.summer 97 % · winter 95 % · humidity 86 %
Morette	38	4.2 km E	358	27.3	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 89 % · humidity 86 %

Elsewhere

Commune website · Wikipedia (en) ·Wikipedia (fr) · INSEE dossier complet · OpenStreetMap · Web search · Map

Permanent link: https://vivantrural.com/en/fr/38171-la-forteresse