| Official Name: | Kaldrma |
| Native Name: | [1] |
| Settlement Type: | Village |
| Pushpin Map: | Croatia |
| Pushpin Label Position: | bottom |
| Coordinates: | 44.3122°N 16.1892°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Croatia |
| Subdivision Type1: | Region |
| Subdivision Type2: | County |
| Subdivision Name2: | Zadar County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Gračac |
| Unit Pref: | Metric |
| Area Footnotes: | [2] |
| Area Total Km2: | 4.1 |
| Elevation M: | 679 |
| Population As Of: | 2021 |
| Population Total: | 20 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 23446 Kaldrma |
| Area Code: | +385 (23) |
Kaldrma (Serbian: Калдрма)[1] is a village located in the Gračac municipality within the Zadar County in Croatia.
According to the 2011 census, Kaldrma had 31 inhabitants.
| Population[3] | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1857 | 1869 | 1880 | 1890 | 1900 | 1910 | 1921 | 1931 | 1948 | 1953 | 1961 | 1971 | 1981 | 1991 | 2001 | 2011 |
| 246 | 252 | 192 | 219 | 239 | 268 | 230 | 281 | 181 | 189 | 212 | 209 | 193 | 175 | 23 | 31 |
According to the 1991 census, settlement of Kaldrma had 175 inhabitants, which were ethnically declared as this:
According to the 1910 census, settlement of Kaldrma had 268 inhabitants in 2 hamlets, which were linguistically and religiously declared as this:
| Population by language | Croatian or Serbian | |
|---|---|---|
| Kaldrma | 182 | |
| Zavlaka | 86 | |
| Total | 268 (100%) |
| Population by religion | Eastern Orthodox | |
|---|---|---|
| Kaldrma | 182 | |
| Zavlaka | 86 | |
| Total | 268 (100%) |
Kaldrma railway station was built on the Oštrelj-Drvar-Knin narrow-gauge railway in 1902. The so-called Steinbeiss Railway, built mainly to service the fledgling timber industry, branched off past Drvar, further to Jajce and Prijedor. After WWII, in 1948 the Knin-Kaldrma section was upgraded to a normal gauge in order to become a part of a new Una railway, an important rail link between Zagreb and Dalmatia. Old narrow-gauge line towards Drvar branched off from Una railway in Kaldrma. While other narrow-gauge sections further east were gradually closed, amidst heavy lobbying and protests from locals, Kaldrma kept its old link to Drvar until May 28, 1978, when the last train arrived from Drvar to Kaldrma station. In 1987, Una railway was electrified.
Traffic on Una railway was only sporadic during the Croatian War of Independence (1991–1995) due to the breakaway Serb Krajina blockade. After 1995, traffic was not reintroduced due to the damage and difficulties concerning numerous border crossings on the line.[4]
A lake situated northwest from Kaldrma railway station is believed to be a rare example of bifurcation;[5] namely, some of the lake's water ends up in the Black Sea via Una river, while some of it flows into the Adriatic Sea via Krka river.